Enforce constant size and device scale factor for surfaces

android_webview/browser/hardware_renderer.h

 // Copyright 2014 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 ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_
 
 #include <memory>
 
 #include "android_webview/browser/child_frame.h"
@@ skipping 55 matching lines @@
   void DestroySurface();
 
   void CreateNewCompositorFrameSinkSupport();
 
   RenderThreadManager* render_thread_manager_;
 
   typedef void* EGLContext;
   EGLContext last_egl_context_;
 
   // Information about last delegated frame.
-  gfx::Size frame_size_;
+  gfx::Size surface_size_;
+  float device_scale_factor_ = 0;
 
   // Infromation from UI on last commit.
   gfx::Vector2d scroll_offset_;
 
   ChildFrameQueue child_frame_queue_;
 
   // This holds the last ChildFrame received. Contains the frame info of the
   // last frame. The |frame| member is always null since frame has already
   // been submitted.
   std::unique_ptr<ChildFrame> child_frame_;
@@ skipping 10 matching lines @@
   // dropped.
   uint32_t last_committed_compositor_frame_sink_id_;
   uint32_t last_submitted_compositor_frame_sink_id_;
 
   DISALLOW_COPY_AND_ASSIGN(HardwareRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_H_