Enforce constant size and device scale factor for surfaces

android_webview/browser/hardware_renderer.h

Index: android_webview/browser/hardware_renderer.h
diff --git a/android_webview/browser/hardware_renderer.h b/android_webview/browser/hardware_renderer.h
index 511a8c5bf48fdb3b038f835bea53b8627632078d..fb0c305d32ac54b3a98dd5aff424f987b703a594 100644
--- a/android_webview/browser/hardware_renderer.h
+++ b/android_webview/browser/hardware_renderer.h
@@ -56,6 +56,7 @@ class HardwareRenderer : public cc::CompositorFrameSinkSupportClient {
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::LocalSurfaceId& local_surface_id,
                        const gfx::Rect& damage_rect) override;
+  void DidRejectCompositorFrame() override;
 
   void ReturnChildFrame(std::unique_ptr<ChildFrame> child_frame);
   void ReturnResourcesToCompositor(const cc::ReturnedResourceArray& resources,
@@ -73,7 +74,8 @@ class HardwareRenderer : public cc::CompositorFrameSinkSupportClient {
   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_;