WebFrame exports size information for remote frames.

public/web/WebFrameClient.h

Index: public/web/WebFrameClient.h
diff --git a/public/web/WebFrameClient.h b/public/web/WebFrameClient.h
index ce7eb230fd53dc8c13d651ff6db79726a13950a7..88575f497a345a0ad65f848140ad6a82626cb9d7 100644
--- a/public/web/WebFrameClient.h
+++ b/public/web/WebFrameClient.h
@@ -378,6 +378,9 @@ public:
     // process. See http://crbug.com/339659.
     virtual void forwardInputEvent(const WebInputEvent*) { }
 
+    // Send initial drawing parameters to a child frame that is being rendered out of process.
+    virtual void initializeChildFrame(const WebRect& frameRect, float scaleFactor) { }
+
 protected:
     ~WebFrameClient() { }
 };