Support merged Dart-JS callstacks

Source/core/inspector/JavaScriptCallFrame.cpp

Index: Source/core/inspector/JavaScriptCallFrame.cpp
diff --git a/Source/core/inspector/JavaScriptCallFrame.cpp b/Source/core/inspector/JavaScriptCallFrame.cpp
index 813d0b800737a9e99b00366eb17910ecb1a255ea..e47eb7ccfb97b705c859aa9be0867f35f89d2df9 100644
--- a/Source/core/inspector/JavaScriptCallFrame.cpp
+++ b/Source/core/inspector/JavaScriptCallFrame.cpp
@@ -74,6 +74,17 @@ int JavaScriptCallFrame::callV8FunctionReturnInt(const char* name) const
     return 0;
 }
 
+double JavaScriptCallFrame::callV8FunctionReturnDouble(const char* name) const
+{
+    v8::HandleScope handleScope(m_isolate);
+    v8::Handle<v8::Object> callFrame = m_callFrame.newLocal(m_isolate);
+    v8::Handle<v8::Function> func = v8::Handle<v8::Function>::Cast(callFrame->Get(v8AtomicString(m_isolate, name)));
+    v8::Handle<v8::Value> result = func->Call(callFrame, 0, 0);
+    if (result->IsNumber())
+        return result->NumberValue();
+    return 0;
+}
+
 String JavaScriptCallFrame::callV8FunctionReturnString(const char* name) const
 {
     v8::HandleScope handleScope(m_isolate);
@@ -98,6 +109,11 @@ int JavaScriptCallFrame::column() const
     return callV8FunctionReturnInt("column");
 }
 
+double JavaScriptCallFrame::framePointer() const
+{
+    return callV8FunctionReturnDouble("framePointer");
+}
+
 String JavaScriptCallFrame::functionName() const
 {
     return callV8FunctionReturnString("functionName");