Use contents size for android_webview layout.

android_webview/renderer/aw_render_view_ext.h

Index: android_webview/renderer/aw_render_view_ext.h
diff --git a/android_webview/renderer/aw_render_view_ext.h b/android_webview/renderer/aw_render_view_ext.h
index 031d5131b500aa55ebb8ba0953ac7d6d7fc9a602..3149708e81f0360e2c91c18f9ffcf0f821edb520 100644
--- a/android_webview/renderer/aw_render_view_ext.h
+++ b/android_webview/renderer/aw_render_view_ext.h
@@ -7,9 +7,11 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/timer/timer.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/public/web/WebPermissionClient.h"
 #include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/size.h"
 
 namespace WebKit {
 
@@ -38,6 +40,7 @@ class AwRenderViewExt : public content::RenderViewObserver,
                                         bool is_new_navigation) OVERRIDE;
   virtual void FocusedNodeChanged(const WebKit::WebNode& node) OVERRIDE;
   virtual void DidCommitCompositorFrame() OVERRIDE;
+  virtual void DidUpdateLayout() OVERRIDE;
   virtual void Navigate(const GURL& url) OVERRIDE;
 
   void OnDocumentHasImagesRequest(int id);
@@ -53,6 +56,9 @@ class AwRenderViewExt : public content::RenderViewObserver,
 
   void UpdatePageScaleFactor();
 
+  void OnEnableContentsSizeNotifications();
+  void CheckContentsSize();
+
   // WebKit::WebPermissionClient implementation.
   virtual bool allowDisplayingInsecureContent(
       WebKit::WebFrame* frame,
@@ -69,6 +75,10 @@ class AwRenderViewExt : public content::RenderViewObserver,
 
   float page_scale_factor_;
 
+  bool send_contents_size_updates_;
+  gfx::Size last_sent_contents_size_;
+  base::OneShotTimer<AwRenderViewExt> check_contents_size_timer_;
+
   DISALLOW_COPY_AND_ASSIGN(AwRenderViewExt);
 };