Use contents size for android_webview layout.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 7d97f6e84e9fb2e1721103e2f879055fe3f020ae..bd299bccf0903997c8a888f57bfd94e600a801d2 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2816,6 +2816,8 @@ void RenderViewImpl::numberOfWheelEventHandlersChanged(unsigned num_handlers) {
 }
 
 void RenderViewImpl::didUpdateLayout() {
+  FOR_EACH_OBSERVER(RenderViewObserver, observers_, DidUpdateLayout());
+
   // We don't always want to set up a timer, only if we've been put in that
   // mode by getting a |ViewMsg_EnablePreferredSizeChangedMode|
   // message.