Blink changes to record interest rects for http://w3c.github.io/frame-timing/

Source/core/frame/Frame.h

Index: Source/core/frame/Frame.h
diff --git a/Source/core/frame/Frame.h b/Source/core/frame/Frame.h
index 95e26a276202a5e9dd562f0b727268c08e620db4..a41485b71d08cca9b9970c3be8bb15e473fb8ccb 100644
--- a/Source/core/frame/Frame.h
+++ b/Source/core/frame/Frame.h
@@ -101,6 +101,8 @@ public:
 
     LayoutPart* ownerLayoutObject() const; // LayoutObject for the element that contains this frame.
 
+    int64_t frameID() const { return m_frameID; }
+
     Settings* settings() const; // can be null
 
     // isLoading() is true when the embedder should think a load is in progress.
@@ -123,6 +125,8 @@ protected:
 
 private:
     FrameClient* m_client;
+    // Needed to identify Frame Timing requests.
+    int64_t m_frameID;
     bool m_isLoading;
 };