Cross-process frames should be notified of device scale factor changes.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index af92cf43bf7a8709ec7409b1a66a7f324f28b03d..9022c104db705266d00c11ca968637f414fd08ae 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -595,6 +595,8 @@ class CONTENT_EXPORT WebContentsImpl
   void ResizeDueToAutoResize(RenderWidgetHostImpl* render_widget_host,
                              const gfx::Size& new_size) override;
   void ScreenInfoChanged() override;
+  void UpdateDeviceScaleFactor(double device_scale_factor) override;
+  void GetScreenInfo(blink::WebScreenInfo* web_screen_info) override;
   bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                               bool* is_keyboard_shortcut) override;
   void HandleKeyboardEvent(const NativeWebKeyboardEvent& event) override;
@@ -639,6 +641,7 @@ class CONTENT_EXPORT WebContentsImpl
   void OnFirstPaintAfterLoad(RenderWidgetHostImpl* render_widget_host) override;
   TextInputManager* GetTextInputManager() override;
 
+
   // RenderFrameHostManager::Delegate ------------------------------------------
 
   bool CreateRenderViewForRenderManager(