Make window.screen property non replaceable

Source/core/frame/Screen.cpp

Index: Source/core/frame/Screen.cpp
diff --git a/Source/core/frame/Screen.cpp b/Source/core/frame/Screen.cpp
index 7a258ebf77e354fafcb70a318c2f1aa0f15e8067..5a0cf9d769490d5643401aef07481bcfe36411f6 100644
--- a/Source/core/frame/Screen.cpp
+++ b/Source/core/frame/Screen.cpp
@@ -30,6 +30,7 @@
 #include "config.h"
 #include "core/frame/Screen.h"
 
+#include "bindings/v8/Dictionary.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ -37,9 +38,24 @@
 #include "core/inspector/InspectorInstrumentation.h"
 #include "platform/PlatformScreen.h"
 #include "platform/geometry/FloatRect.h"
+#include "wtf/HashMap.h"
 
 namespace WebCore {
 
+typedef HashMap<String, String> ScreenOverrideMap;
+
+static ScreenOverrideMap& overrideScreenData()
+{
+    DEFINE_STATIC_LOCAL(ScreenOverrideMap, overrideData, ());
+    return overrideData;
+}
+
+#define RETURN_OVERRIDE_DATA_IF_EXISTS(name, type) \
+    const ScreenOverrideMap& overrideData = overrideScreenData(); \
+    ScreenOverrideMap::const_iterator it = overrideData.find(name); \
+    if (UNLIKELY(it != overrideData.end())) \
+        return it->value.to##type();
+
 Screen::Screen(LocalFrame* frame)
     : DOMWindowProperty(frame)
 {
@@ -50,6 +66,7 @@ unsigned Screen::height() const
 {
     if (!m_frame)
         return 0;
+    RETURN_OVERRIDE_DATA_IF_EXISTS("height", UInt);
     FrameHost* host = m_frame->host();
     if (host && host->settings().reportScreenSizeInPhysicalPixelsQuirk())
         return lroundf(screenRect(m_frame->view()).height() * host->deviceScaleFactor());
@@ -60,6 +77,7 @@ unsigned Screen::width() const
 {
     if (!m_frame)
         return 0;
+    RETURN_OVERRIDE_DATA_IF_EXISTS("width", UInt);
     FrameHost* host = m_frame->host();
     if (host && host->settings().reportScreenSizeInPhysicalPixelsQuirk())
         return lroundf(screenRect(m_frame->view()).width() * host->deviceScaleFactor());
@@ -84,6 +102,7 @@ int Screen::availLeft() const
 {
     if (!m_frame)
         return 0;
+    RETURN_OVERRIDE_DATA_IF_EXISTS("availLeft", Int);
     FrameHost* host = m_frame->host();
     if (host && host->settings().reportScreenSizeInPhysicalPixelsQuirk())
         return lroundf(screenAvailableRect(m_frame->view()).x() * host->deviceScaleFactor());
@@ -94,6 +113,7 @@ int Screen::availTop() const
 {
     if (!m_frame)
         return 0;
+    RETURN_OVERRIDE_DATA_IF_EXISTS("availTop", Int);
     FrameHost* host = m_frame->host();
     if (host && host->settings().reportScreenSizeInPhysicalPixelsQuirk())
         return lroundf(screenAvailableRect(m_frame->view()).y() * host->deviceScaleFactor());
@@ -104,6 +124,7 @@ unsigned Screen::availHeight() const
 {
     if (!m_frame)
         return 0;
+    RETURN_OVERRIDE_DATA_IF_EXISTS("availHeight", UInt);
     FrameHost* host = m_frame->host();
     if (host && host->settings().reportScreenSizeInPhysicalPixelsQuirk())
         return lroundf(screenAvailableRect(m_frame->view()).height() * host->deviceScaleFactor());
@@ -114,6 +135,7 @@ unsigned Screen::availWidth() const
 {
     if (!m_frame)
         return 0;
+    RETURN_OVERRIDE_DATA_IF_EXISTS("availWidth", UInt);
     FrameHost* host = m_frame->host();
     if (host && host->settings().reportScreenSizeInPhysicalPixelsQuirk())
         return lroundf(screenAvailableRect(m_frame->view()).width() * host->deviceScaleFactor());
@@ -137,4 +159,14 @@ void Screen::trace(Visitor* visitor)
     WillBeHeapSupplementable<Screen>::trace(visitor);
 }
 
+void Screen::setOverrideScreenData(const Dictionary& overrideData)
+{
+    overrideData.getOwnPropertiesAsStringHashMap(overrideScreenData());
+}
+
+void Screen::clearOverrideScreenData()
+{
+    overrideScreenData().clear();
+}
+
 } // namespace WebCore