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..a99fb73815057c5b0a1bd64867178cc78b7d4aff 100644
--- a/android_webview/browser/hardware_renderer.h
+++ b/android_webview/browser/hardware_renderer.h
@@ -73,7 +73,8 @@ 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_;