Implementation of device metrics emulation in render view.

content/renderer/gpu/input_handler_wrapper.h

Index: content/renderer/gpu/input_handler_wrapper.h
===================================================================
--- content/renderer/gpu/input_handler_wrapper.h	(revision 221161)
+++ content/renderer/gpu/input_handler_wrapper.h	(working copy)
@@ -27,6 +27,9 @@
   int routing_id() const { return routing_id_; }
   InputHandlerProxy* input_handler_proxy() { return &input_handler_proxy_; }
 
+  InputEventRewriter* rewriter() const { return rewriter_.get(); }
+  void SetRewriter(scoped_ptr<InputEventRewriter> rewriter);
+
   // InputHandlerProxyClient implementation.
   virtual void WillShutdown() OVERRIDE;
   virtual void TransferActiveWheelFlingAnimation(
@@ -46,6 +49,7 @@
   int routing_id_;
   InputHandlerProxy input_handler_proxy_;
   scoped_refptr<base::MessageLoopProxy> main_loop_;
+  scoped_ptr<InputEventRewriter> rewriter_;
 
   // Can only be accessed on the main thread.
   base::WeakPtr<RenderViewImpl> render_view_impl_;