bindings,devtools: Shows DOM attributes' values in DevTools.

Source/bindings/core/v8/V8Binding.h

Index: Source/bindings/core/v8/V8Binding.h
diff --git a/Source/bindings/core/v8/V8Binding.h b/Source/bindings/core/v8/V8Binding.h
index c106cb10058766f72ffce025bec427b936906da2..94b99472b0a0ebaa4d2b77650680307c57d59d4b 100644
--- a/Source/bindings/core/v8/V8Binding.h
+++ b/Source/bindings/core/v8/V8Binding.h
@@ -995,6 +995,21 @@ private:
 
 PassRefPtr<TraceEvent::ConvertableToTraceFormat> devToolsTraceEventData(v8::Isolate*, ExecutionContext*, v8::Handle<v8::Function>);
 
+class AttributesWithObservableSideEffectOnGet final {
+public:
+    // Returns true iff |domObject| is a DOM object and whose attribute named
+    // |attributeName| has no observable side effect when "get" is called.
+    static bool hasNoSideEffect(v8::Isolate*, v8::Handle<v8::Value> domObject, v8::Handle<v8::Value> attributeName);
+
+    // Registers a DOM attribute which has side effect when "get" is called.
+    static void add(const WrapperTypeInfo*, String attributeName);
+
+private:
+    typedef Vector<std::pair<const WrapperTypeInfo*, String>> AttributeSet;
+
+    static AttributeSet* attributesWithSideEffectOnGet();
+};
+
 class V8RethrowTryCatchScope final {
 public:
     explicit V8RethrowTryCatchScope(v8::TryCatch& block) : m_block(block) { }