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diff --git a/Source/WebCore/editing/EditingStyle.cpp b/Source/WebCore/editing/EditingStyle.cpp
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+/*
+ * Copyright (C) 2007, 2008, 2009 Apple Computer, Inc.
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "EditingStyle.h"
+
+#include "ApplyStyleCommand.h"
+#include "CSSComputedStyleDeclaration.h"
+#include "CSSMutableStyleDeclaration.h"
+#include "CSSValueKeywords.h"
+#include "Frame.h"
+#include "Node.h"
+#include "Position.h"
+#include "RenderStyle.h"
+#include "SelectionController.h"
+
+namespace WebCore {
+
+// Editing style properties must be preserved during editing operation.
+// e.g. when a user inserts a new paragraph, all properties listed here must be copied to the new paragraph.
+// FIXME: The current editingStyleProperties contains all inheritableProperties but we may not need to preserve all inheritable properties
+static const int editingStyleProperties[] = {
+    // CSS inheritable properties
+    CSSPropertyBorderCollapse,
+    CSSPropertyColor,
+    CSSPropertyFontFamily,
+    CSSPropertyFontSize,
+    CSSPropertyFontStyle,
+    CSSPropertyFontVariant,
+    CSSPropertyFontWeight,
+    CSSPropertyLetterSpacing,
+    CSSPropertyLineHeight,
+    CSSPropertyOrphans,
+    CSSPropertyTextAlign,
+    CSSPropertyTextIndent,
+    CSSPropertyTextTransform,
+    CSSPropertyWhiteSpace,
+    CSSPropertyWidows,
+    CSSPropertyWordSpacing,
+    CSSPropertyWebkitBorderHorizontalSpacing,
+    CSSPropertyWebkitBorderVerticalSpacing,
+    CSSPropertyWebkitTextDecorationsInEffect,
+    CSSPropertyWebkitTextFillColor,
+    CSSPropertyWebkitTextSizeAdjust,
+    CSSPropertyWebkitTextStrokeColor,
+    CSSPropertyWebkitTextStrokeWidth,
+};
+size_t numEditingStyleProperties = WTF_ARRAY_LENGTH(editingStyleProperties);
+
+static PassRefPtr<CSSMutableStyleDeclaration> copyEditingProperties(CSSStyleDeclaration* style)
+{
+    return style->copyPropertiesInSet(editingStyleProperties, numEditingStyleProperties);
+}
+
+static PassRefPtr<CSSMutableStyleDeclaration> editingStyleFromComputedStyle(PassRefPtr<CSSComputedStyleDeclaration> style)
+{
+    if (!style)
+        return CSSMutableStyleDeclaration::create();
+    return copyEditingProperties(style.get());
+}
+
+float EditingStyle::NoFontDelta = 0.0f;
+
+EditingStyle::EditingStyle()
+    : m_shouldUseFixedDefaultFontSize(false)
+    , m_fontSizeDelta(NoFontDelta)
+{
+}
+
+EditingStyle::EditingStyle(Node* node)
+    : m_shouldUseFixedDefaultFontSize(false)
+    , m_fontSizeDelta(NoFontDelta)
+{
+    init(node);
+}
+
+EditingStyle::EditingStyle(const Position& position)
+    : m_shouldUseFixedDefaultFontSize(false)
+    , m_fontSizeDelta(NoFontDelta)
+{
+    init(position.node());
+}
+
+EditingStyle::EditingStyle(const CSSStyleDeclaration* style)
+    : m_mutableStyle(style->copy())
+    , m_shouldUseFixedDefaultFontSize(false)
+    , m_fontSizeDelta(NoFontDelta)
+{
+    extractFontSizeDelta();
+}
+
+EditingStyle::~EditingStyle()
+{
+}
+
+void EditingStyle::init(Node* node)
+{
+    RefPtr<CSSComputedStyleDeclaration> computedStyleAtPosition = computedStyle(node);
+    m_mutableStyle = editingStyleFromComputedStyle(computedStyleAtPosition);
+
+    if (node && node->computedStyle()) {
+        RenderStyle* renderStyle = node->computedStyle();
+        removeTextFillAndStrokeColorsIfNeeded(renderStyle);
+        replaceFontSizeByKeywordIfPossible(renderStyle, computedStyleAtPosition.get());
+    }
+
+    m_shouldUseFixedDefaultFontSize = computedStyleAtPosition->useFixedFontDefaultSize();
+    extractFontSizeDelta();
+}
+
+void EditingStyle::removeTextFillAndStrokeColorsIfNeeded(RenderStyle* renderStyle)
+{
+    // If a node's text fill color is invalid, then its children use 
+    // their font-color as their text fill color (they don't
+    // inherit it).  Likewise for stroke color.
+    ExceptionCode ec = 0;
+    if (!renderStyle->textFillColor().isValid())
+        m_mutableStyle->removeProperty(CSSPropertyWebkitTextFillColor, ec);
+    if (!renderStyle->textStrokeColor().isValid())
+        m_mutableStyle->removeProperty(CSSPropertyWebkitTextStrokeColor, ec);
+    ASSERT(!ec);
+}
+
+void EditingStyle::replaceFontSizeByKeywordIfPossible(RenderStyle* renderStyle, CSSComputedStyleDeclaration* computedStyle)
+{
+    ASSERT(renderStyle);
+    if (renderStyle->fontDescription().keywordSize())
+        m_mutableStyle->setProperty(CSSPropertyFontSize, computedStyle->getFontSizeCSSValuePreferringKeyword()->cssText());
+}
+
+void EditingStyle::extractFontSizeDelta()
+{
+    if (m_mutableStyle->getPropertyCSSValue(CSSPropertyFontSize)) {
+        // Explicit font size overrides any delta.
+        m_mutableStyle->removeProperty(CSSPropertyWebkitFontSizeDelta);
+        return;
+    }
+
+    // Get the adjustment amount out of the style.
+    RefPtr<CSSValue> value = m_mutableStyle->getPropertyCSSValue(CSSPropertyWebkitFontSizeDelta);
+    if (!value || value->cssValueType() != CSSValue::CSS_PRIMITIVE_VALUE)
+        return;
+
+    CSSPrimitiveValue* primitiveValue = static_cast<CSSPrimitiveValue*>(value.get());
+
+    // Only PX handled now. If we handle more types in the future, perhaps
+    // a switch statement here would be more appropriate.
+    if (primitiveValue->primitiveType() != CSSPrimitiveValue::CSS_PX)
+        return;
+
+    m_fontSizeDelta = primitiveValue->getFloatValue();
+    m_mutableStyle->removeProperty(CSSPropertyWebkitFontSizeDelta);
+}
+
+bool EditingStyle::isEmpty() const
+{
+    return (!m_mutableStyle || m_mutableStyle->isEmpty()) && m_fontSizeDelta == NoFontDelta;
+}
+
+bool EditingStyle::textDirection(WritingDirection& writingDirection) const
+{
+    RefPtr<CSSValue> unicodeBidi = m_mutableStyle->getPropertyCSSValue(CSSPropertyUnicodeBidi);
+    if (!unicodeBidi)
+        return false;
+
+    ASSERT(unicodeBidi->isPrimitiveValue());
+    int unicodeBidiValue = static_cast<CSSPrimitiveValue*>(unicodeBidi.get())->getIdent();
+    if (unicodeBidiValue == CSSValueEmbed) {
+        RefPtr<CSSValue> direction = m_mutableStyle->getPropertyCSSValue(CSSPropertyDirection);
+        ASSERT(!direction || direction->isPrimitiveValue());
+        if (!direction)
+            return false;
+
+        writingDirection = static_cast<CSSPrimitiveValue*>(direction.get())->getIdent() == CSSValueLtr ? LeftToRightWritingDirection : RightToLeftWritingDirection;
+
+        return true;
+    }
+
+    if (unicodeBidiValue == CSSValueNormal) {
+        writingDirection = NaturalWritingDirection;
+        return true;
+    }
+
+    return false;
+}
+
+void EditingStyle::setStyle(PassRefPtr<CSSMutableStyleDeclaration> style)
+{
+    m_mutableStyle = style;
+    // FIXME: We should be able to figure out whether or not font is fixed width for mutable style.
+    // We need to check font-family is monospace as in FontDescription but we don't want to duplicate code here.
+    m_shouldUseFixedDefaultFontSize = false;
+    extractFontSizeDelta();
+}
+
+void EditingStyle::overrideWithStyle(const CSSMutableStyleDeclaration* style)
+{
+    if (!style || !style->length())
+        return;
+    if (!m_mutableStyle)
+        m_mutableStyle = CSSMutableStyleDeclaration::create();
+    m_mutableStyle->merge(style);
+    extractFontSizeDelta();
+}
+
+void EditingStyle::clear()
+{
+    m_mutableStyle.clear();
+    m_shouldUseFixedDefaultFontSize = false;
+    m_fontSizeDelta = NoFontDelta;
+}
+
+PassRefPtr<EditingStyle> EditingStyle::copy() const
+{
+    RefPtr<EditingStyle> copy = EditingStyle::create();
+    if (m_mutableStyle)
+        copy->m_mutableStyle = m_mutableStyle->copy();
+    copy->m_shouldUseFixedDefaultFontSize = m_shouldUseFixedDefaultFontSize;
+    copy->m_fontSizeDelta = m_fontSizeDelta;
+    return copy;
+}
+
+PassRefPtr<EditingStyle> EditingStyle::extractAndRemoveBlockProperties()
+{
+    RefPtr<EditingStyle> blockProperties = EditingStyle::create();
+    if (!m_mutableStyle)
+        return blockProperties;
+
+    blockProperties->m_mutableStyle = m_mutableStyle->copyBlockProperties();
+    m_mutableStyle->removeBlockProperties();
+
+    return blockProperties;
+}
+
+void EditingStyle::removeBlockProperties()
+{
+    if (!m_mutableStyle)
+        return;
+
+    m_mutableStyle->removeBlockProperties();
+}
+
+void EditingStyle::removeStyleAddedByNode(Node* node)
+{
+    if (!node || !node->parentNode())
+        return;
+    RefPtr<CSSMutableStyleDeclaration> parentStyle = editingStyleFromComputedStyle(computedStyle(node->parentNode()));
+    RefPtr<CSSMutableStyleDeclaration> nodeStyle = editingStyleFromComputedStyle(computedStyle(node));
+    parentStyle->diff(nodeStyle.get());
+    nodeStyle->diff(m_mutableStyle.get());
+}
+
+void EditingStyle::removeStyleConflictingWithStyleOfNode(Node* node)
+{
+    if (!node || !node->parentNode() || !m_mutableStyle)
+        return;
+    RefPtr<CSSMutableStyleDeclaration> parentStyle = editingStyleFromComputedStyle(computedStyle(node->parentNode()));
+    RefPtr<CSSMutableStyleDeclaration> nodeStyle = editingStyleFromComputedStyle(computedStyle(node));
+    parentStyle->diff(nodeStyle.get());
+
+    CSSMutableStyleDeclaration::const_iterator end = nodeStyle->end();
+    for (CSSMutableStyleDeclaration::const_iterator it = nodeStyle->begin(); it != end; ++it)
+        m_mutableStyle->removeProperty(it->id());
+}
+
+void EditingStyle::removeNonEditingProperties()
+{
+    if (m_mutableStyle)
+        m_mutableStyle = copyEditingProperties(m_mutableStyle.get());
+}
+
+void EditingStyle::prepareToApplyAt(const Position& position, ShouldPreserveWritingDirection shouldPreserveWritingDirection)
+{
+    if (!m_mutableStyle)
+        return;
+
+    // ReplaceSelectionCommand::handleStyleSpans() requires that this function only removes the editing style.
+    // If this function was modified in the future to delete all redundant properties, then add a boolean value to indicate
+    // which one of editingStyleAtPosition or computedStyle is called.
+    RefPtr<EditingStyle> style = EditingStyle::create(position);
+
+    RefPtr<CSSValue> unicodeBidi;
+    RefPtr<CSSValue> direction;
+    if (shouldPreserveWritingDirection == PreserveWritingDirection) {
+        unicodeBidi = m_mutableStyle->getPropertyCSSValue(CSSPropertyUnicodeBidi);
+        direction = m_mutableStyle->getPropertyCSSValue(CSSPropertyDirection);
+    }
+
+    style->m_mutableStyle->diff(m_mutableStyle.get());
+
+    // if alpha value is zero, we don't add the background color.
+    RefPtr<CSSValue> backgroundColor = m_mutableStyle->getPropertyCSSValue(CSSPropertyBackgroundColor);
+    if (backgroundColor && backgroundColor->isPrimitiveValue()
+        && !alphaChannel(static_cast<CSSPrimitiveValue*>(backgroundColor.get())->getRGBA32Value())) {
+        ExceptionCode ec;
+        m_mutableStyle->removeProperty(CSSPropertyBackgroundColor, ec);
+    }
+
+    if (unicodeBidi) {
+        ASSERT(unicodeBidi->isPrimitiveValue());
+        m_mutableStyle->setProperty(CSSPropertyUnicodeBidi, static_cast<CSSPrimitiveValue*>(unicodeBidi.get())->getIdent());
+        if (direction) {
+            ASSERT(direction->isPrimitiveValue());
+            m_mutableStyle->setProperty(CSSPropertyDirection, static_cast<CSSPrimitiveValue*>(direction.get())->getIdent());
+        }
+    }
+}
+
+PassRefPtr<EditingStyle> editingStyleIncludingTypingStyle(const Position& position)
+{
+    RefPtr<EditingStyle> editingStyle = EditingStyle::create(position);
+    RefPtr<EditingStyle> typingStyle = position.node()->document()->frame()->selection()->typingStyle();
+    if (typingStyle && typingStyle->style())
+        editingStyle->style()->merge(copyEditingProperties(typingStyle->style()).get());
+    return editingStyle;
+}
+    
+}