[UseZoomForDSF] Support drag&drop

content/browser/renderer_host/render_view_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 337 matching lines @@
   // Returns whether the current RenderProcessHost has read access to the files
   // reported in |state|.
   bool CanAccessFilesOfPageState(const PageState& state) const;
 
   // Grants the current RenderProcessHost read access to any file listed in
   // |validated_state|.  It is important that the PageState has been validated
   // upon receipt from the renderer process to prevent it from forging access to
   // files without the user's consent.
   void GrantFileAccessFromPageState(const PageState& validated_state);
 
+  // Convers the dip to viewport coordinates.

[dcheng, 2016/01/26 18:52:15]

Nit:
Converts a point from DIPs to viewport coordinates
  or
just remove it (the comment is pretty obvious from the function signature)
  or
link to explanation of difference between DIPs and viewport coordinates.

+  gfx::Point ConvertDIPToViewport(const gfx::Point& point);
+
   // The RenderWidgetHost.
   scoped_ptr<RenderWidgetHostImpl> render_widget_host_;
 
   // The number of RenderFrameHosts which have a reference to this RVH.
   int frames_ref_count_;
 
   // Our delegate, which wants to know about changes in the RenderView.
   RenderViewHostDelegate* delegate_;
 
   // The SiteInstance associated with this RenderViewHost.  All pages drawn
@@ skipping 58 matching lines @@
   bool render_view_ready_on_process_launch_;
 
   base::WeakPtrFactory<RenderViewHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_