Support merged Dart-JS callstacks

Source/core/inspector/JavaScriptCallFrame.h

Index: Source/core/inspector/JavaScriptCallFrame.h
diff --git a/Source/core/inspector/JavaScriptCallFrame.h b/Source/core/inspector/JavaScriptCallFrame.h
index e4996b37ea1ae9b2199fa9d47e72979196eee217..a8d89228bdb4742be10fdd6323a691ad4430ca22 100644
--- a/Source/core/inspector/JavaScriptCallFrame.h
+++ b/Source/core/inspector/JavaScriptCallFrame.h
@@ -58,6 +58,8 @@ public:
     int line() const;
     int column() const;
     String functionName() const;
+    double framePointer() const;
+
 
     v8::Handle<v8::Value> scopeChain() const;
     int scopeType(int scopeIndex) const;
@@ -74,6 +76,7 @@ private:
     JavaScriptCallFrame(v8::Handle<v8::Context> debuggerContext, v8::Handle<v8::Object> callFrame);
 
     int callV8FunctionReturnInt(const char* name) const;
+    double callV8FunctionReturnDouble(const char* name) const;
     String callV8FunctionReturnString(const char* name) const;
 
     v8::Isolate* m_isolate;