Convert the coordinates in WebInputEvent To Viewport in InputRouter

content/browser/renderer_host/input/input_router_impl.h

Index: content/browser/renderer_host/input/input_router_impl.h
diff --git a/content/browser/renderer_host/input/input_router_impl.h b/content/browser/renderer_host/input/input_router_impl.h
index e1ea09a149b39b226d5c2d9e4164486180950f21..d6132895025ef3b6210c29b7bdc44b8d87df1ca5 100644
--- a/content/browser/renderer_host/input/input_router_impl.h
+++ b/content/browser/renderer_host/input/input_router_impl.h
@@ -68,6 +68,7 @@ class CONTENT_EXPORT InputRouterImpl
   void NotifySiteIsMobileOptimized(bool is_mobile_optimized) override;
   void RequestNotificationWhenFlushed() override;
   bool HasPendingEvents() const override;
+  void SetDeviceScaleFactor(float device_scale_factor) override;
 
   // IPC::Listener
   bool OnMessageReceived(const IPC::Message& message) override;
@@ -251,6 +252,8 @@ private:
   InputEventStreamValidator input_stream_validator_;
   InputEventStreamValidator output_stream_validator_;
 
+  float device_scale_factor_;
+
   DISALLOW_COPY_AND_ASSIGN(InputRouterImpl);
 };