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diff --git a/Source/WebKit2/Shared/WebPreferencesStore.cpp b/Source/WebKit2/Shared/WebPreferencesStore.cpp
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+++ b/Source/WebKit2/Shared/WebPreferencesStore.cpp
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+/*
+ * Copyright (C) 2010, 2011 Apple 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 APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "WebPreferencesStore.h"
+
+#include "FontSmoothingLevel.h"
+#include "WebCoreArgumentCoders.h"
+
+namespace WebKit {
+
+namespace WebPreferencesKey {
+
+#define DEFINE_KEY_GETTERS(KeyUpper, KeyLower, TypeName, Type, DefaultValue) \
+        const String& KeyLower##Key() \
+        { \
+            DEFINE_STATIC_LOCAL(String, key, (#KeyUpper)); \
+            return key; \
+        }
+
+    FOR_EACH_WEBKIT_PREFERENCE(DEFINE_KEY_GETTERS)
+
+#undef DEFINE_KEY_GETTERS
+
+} // namespace WebPreferencesKey
+
+
+static bool hasXSSAuditorEnabledTestRunnerOverride;
+static bool xssAuditorEnabledTestRunnerOverride;
+
+WebPreferencesStore::WebPreferencesStore()
+{
+}
+
+void WebPreferencesStore::encode(CoreIPC::ArgumentEncoder* encoder) const
+{
+    encoder->encode(CoreIPC::In(m_stringValues, m_boolValues, m_uint32Values, m_doubleValues));
+}
+
+bool WebPreferencesStore::decode(CoreIPC::ArgumentDecoder* decoder, WebPreferencesStore& s)
+{
+    if (!decoder->decode(CoreIPC::Out(s.m_stringValues, s.m_boolValues, s.m_uint32Values, s.m_doubleValues)))
+        return false;
+
+    if (hasXSSAuditorEnabledTestRunnerOverride)
+        s.m_boolValues.set(WebPreferencesKey::xssAuditorEnabledKey(), xssAuditorEnabledTestRunnerOverride);
+
+    return true;
+}
+
+void WebPreferencesStore::overrideXSSAuditorEnabledForTestRunner(bool enabled)
+{
+    hasXSSAuditorEnabledTestRunnerOverride = true;
+    xssAuditorEnabledTestRunnerOverride = enabled;
+}
+
+void WebPreferencesStore::removeTestRunnerOverrides()
+{
+    hasXSSAuditorEnabledTestRunnerOverride = false;
+}
+
+
+template<typename MappedType>
+MappedType defaultValueForKey(const String&);
+
+template<>
+String defaultValueForKey(const String& key)
+{
+    static HashMap<String, String>& defaults = *new HashMap<String, String>;
+    if (defaults.isEmpty()) {
+#define DEFINE_STRING_DEFAULTS(KeyUpper, KeyLower, TypeName, Type, DefaultValue) defaults.set(WebPreferencesKey::KeyLower##Key(), DefaultValue);
+        FOR_EACH_WEBKIT_STRING_PREFERENCE(DEFINE_STRING_DEFAULTS)
+#undef DEFINE_STRING_DEFAULTS
+    }
+
+    return defaults.get(key);
+}
+
+template<>
+bool defaultValueForKey(const String& key)
+{
+    static HashMap<String, bool>& defaults = *new HashMap<String, bool>;
+    if (defaults.isEmpty()) {
+#define DEFINE_BOOL_DEFAULTS(KeyUpper, KeyLower, TypeName, Type, DefaultValue) defaults.set(WebPreferencesKey::KeyLower##Key(), DefaultValue);
+        FOR_EACH_WEBKIT_BOOL_PREFERENCE(DEFINE_BOOL_DEFAULTS)
+#undef DEFINE_BOOL_DEFAULTS
+    }
+
+    return defaults.get(key);
+}
+
+template<>
+uint32_t defaultValueForKey(const String& key)
+{
+    static HashMap<String, uint32_t>& defaults = *new HashMap<String, uint32_t>;
+    if (defaults.isEmpty()) {
+#define DEFINE_UINT32_DEFAULTS(KeyUpper, KeyLower, TypeName, Type, DefaultValue) defaults.set(WebPreferencesKey::KeyLower##Key(), DefaultValue);
+        FOR_EACH_WEBKIT_UINT32_PREFERENCE(DEFINE_UINT32_DEFAULTS)
+#undef DEFINE_UINT32_DEFAULTS
+    }
+
+    return defaults.get(key);
+}
+
+template<>
+double defaultValueForKey(const String& key)
+{
+    static HashMap<String, double>& defaults = *new HashMap<String, double>;
+    if (defaults.isEmpty()) {
+#define DEFINE_DOUBLE_DEFAULTS(KeyUpper, KeyLower, TypeName, Type, DefaultValue) defaults.set(WebPreferencesKey::KeyLower##Key(), DefaultValue);
+        FOR_EACH_WEBKIT_DOUBLE_PREFERENCE(DEFINE_DOUBLE_DEFAULTS)
+#undef DEFINE_DOUBLE_DEFAULTS
+    }
+
+    return defaults.get(key);
+}
+
+template<typename MapType>
+static typename MapType::MappedType valueForKey(const MapType& map, const typename MapType::KeyType& key)
+{
+    typename MapType::const_iterator it = map.find(key);
+    if (it != map.end())
+        return it->second;
+
+    return defaultValueForKey<typename MapType::MappedType>(key);
+}
+
+template<typename MapType>
+static bool setValueForKey(MapType& map, const typename MapType::KeyType& key, const typename MapType::MappedType& value)
+{
+    typename MapType::MappedType existingValue = valueForKey(map, key);
+    if (existingValue == value)
+        return false;
+    
+    map.set(key, value);
+    return true;
+}
+
+bool WebPreferencesStore::setStringValueForKey(const String& key, const String& value)
+{
+    return setValueForKey(m_stringValues, key, value);
+}
+
+String WebPreferencesStore::getStringValueForKey(const String& key) const
+{
+    return valueForKey(m_stringValues, key);
+}
+
+bool WebPreferencesStore::setBoolValueForKey(const String& key, bool value)
+{
+    return setValueForKey(m_boolValues, key, value);
+}
+
+bool WebPreferencesStore::getBoolValueForKey(const String& key) const
+{
+    return valueForKey(m_boolValues, key);
+}
+
+bool WebPreferencesStore::setUInt32ValueForKey(const String& key, uint32_t value) 
+{
+    return setValueForKey(m_uint32Values, key, value);
+}
+
+uint32_t WebPreferencesStore::getUInt32ValueForKey(const String& key) const
+{
+    return valueForKey(m_uint32Values, key);
+}
+
+bool WebPreferencesStore::setDoubleValueForKey(const String& key, double value) 
+{
+    return setValueForKey(m_doubleValues, key, value);
+}
+
+double WebPreferencesStore::getDoubleValueForKey(const String& key) const
+{
+    return valueForKey(m_doubleValues, key);
+}
+
+} // namespace WebKit