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diff --git a/WebCore/inspector/InspectorFrontendClientLocal.cpp b/WebCore/inspector/InspectorFrontendClientLocal.cpp
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+++ b/WebCore/inspector/InspectorFrontendClientLocal.cpp
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+/*
+ * 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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 "InspectorFrontendClientLocal.h"
+
+#if ENABLE(INSPECTOR)
+
+#include "Chrome.h"
+#include "FloatRect.h"
+#include "Frame.h"
+#include "FrameView.h"
+#include "InspectorController.h"
+#include "InspectorFrontend.h"
+#include "InspectorFrontendHost.h"
+#include "Page.h"
+#include "PlatformString.h"
+#include "ScriptFunctionCall.h"
+#include "ScriptObject.h"
+
+namespace WebCore {
+
+static const char* const inspectorAttachedHeightName = "inspectorAttachedHeight";
+static const unsigned defaultAttachedHeight = 300;
+static const float minimumAttachedHeight = 250.0f;
+static const float maximumAttachedHeightRatio = 0.75f;
+
+InspectorFrontendClientLocal::InspectorFrontendClientLocal(InspectorController* inspectorController, Page* frontendPage)
+    : m_inspectorController(inspectorController)
+    , m_frontendPage(frontendPage)
+    , m_frontendScriptState(0)
+{
+}
+
+InspectorFrontendClientLocal::~InspectorFrontendClientLocal()
+{
+    if (m_frontendHost)
+        m_frontendHost->disconnectClient();
+    m_frontendScriptState = 0;
+    m_frontendPage = 0;
+    m_inspectorController = 0;
+}
+    
+void InspectorFrontendClientLocal::windowObjectCleared()
+{
+    // Grant the inspector the ability to script the inspected page.
+    m_frontendPage->mainFrame()->document()->securityOrigin()->grantUniversalAccess();
+    // FIXME: don't keep reference to the script state
+    m_frontendScriptState = scriptStateFromPage(debuggerWorld(), m_frontendPage);
+    ScriptGlobalObject::set(m_frontendScriptState, "InspectorBackend", m_inspectorController->inspectorBackend());
+    m_frontendHost = InspectorFrontendHost::create(this, m_frontendPage);
+    ScriptGlobalObject::set(m_frontendScriptState, "InspectorFrontendHost", m_frontendHost.get());
+}
+
+void InspectorFrontendClientLocal::frontendLoaded()
+{
+    bringToFront();
+    // Create InspectorFrontend and set it to InspectorController.
+    ASSERT(m_frontendScriptState);
+    ScriptObject webInspectorObj;
+    if (!ScriptGlobalObject::get(m_frontendScriptState, "WebInspector", webInspectorObj)) {
+        ASSERT_NOT_REACHED();
+        return;
+    }
+    m_inspectorController->setFrontend(new InspectorFrontend(webInspectorObj));
+}
+
+void InspectorFrontendClientLocal::requestAttachWindow()
+{
+    if (!canAttachWindow())
+        return;
+    attachWindow();
+    setAttachedWindow(true);
+}
+
+void InspectorFrontendClientLocal::requestDetachWindow()
+{
+    detachWindow();
+    setAttachedWindow(false);
+}
+
+bool InspectorFrontendClientLocal::canAttachWindow()
+{
+    unsigned inspectedPageHeight = m_inspectorController->inspectedPage()->mainFrame()->view()->visibleHeight();
+
+    // Don't allow the attach if the window would be too small to accommodate the minimum inspector height.
+    return minimumAttachedHeight <= inspectedPageHeight * maximumAttachedHeightRatio;
+}
+
+void InspectorFrontendClientLocal::changeAttachedWindowHeight(unsigned height)
+{
+    unsigned totalHeight = m_frontendPage->mainFrame()->view()->visibleHeight() + m_inspectorController->inspectedPage()->mainFrame()->view()->visibleHeight();
+    unsigned attachedHeight = constrainedAttachedWindowHeight(height, totalHeight);
+    m_inspectorController->setSetting(inspectorAttachedHeightName, String::number(attachedHeight));
+    setAttachedWindowHeight(attachedHeight);
+}
+
+void InspectorFrontendClientLocal::moveWindowBy(float x, float y)
+{
+    FloatRect frameRect = m_frontendPage->chrome()->windowRect();
+    frameRect.move(x, y);
+    m_frontendPage->chrome()->setWindowRect(frameRect);
+}
+
+void InspectorFrontendClientLocal::setAttachedWindow(bool attached)
+{
+    ScriptObject webInspectorObj;
+    if (!ScriptGlobalObject::get(m_frontendScriptState, "WebInspector", webInspectorObj)) {
+        ASSERT_NOT_REACHED();
+        return;
+    }
+    ScriptFunctionCall function(webInspectorObj, "dispatch"); 
+    function.appendArgument("setAttachedWindow");
+    function.appendArgument(attached);
+    function.call();
+}
+
+void InspectorFrontendClientLocal::restoreAttachedWindowHeight()
+{
+    unsigned inspectedPageHeight = m_inspectorController->inspectedPage()->mainFrame()->view()->visibleHeight();
+    String attachedHeight = m_inspectorController->setting(inspectorAttachedHeightName);
+    bool success = true;
+    int height = attachedHeight.toInt(&success);
+    unsigned preferredHeight = success ? height : defaultAttachedHeight;
+    
+    // This call might not go through (if the window starts out detached), but if the window is initially created attached,
+    // InspectorController::attachWindow is never called, so we need to make sure to set the attachedWindowHeight.
+    // FIXME: Clean up code so we only have to call setAttachedWindowHeight in InspectorController::attachWindow
+    setAttachedWindowHeight(constrainedAttachedWindowHeight(preferredHeight, inspectedPageHeight));
+}
+
+unsigned InspectorFrontendClientLocal::constrainedAttachedWindowHeight(unsigned preferredHeight, unsigned totalWindowHeight)
+{
+    using namespace std;
+    return roundf(max(minimumAttachedHeight, min<float>(preferredHeight, totalWindowHeight * maximumAttachedHeightRatio)));
+}
+    
+} // namespace WebCore
+
+#endif