Use contents size for android_webview layout.

android_webview/browser/renderer_host/aw_render_view_host_ext.cc

Index: android_webview/browser/renderer_host/aw_render_view_host_ext.cc
diff --git a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
index 78d6cf4b4efb3361416185bc6e953582162e04fe..d6015503932a53d466b0936718414bf0de6d6873 100644
--- a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
+++ b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
@@ -100,6 +100,11 @@ void AwRenderViewHostExt::SetJsOnlineProperty(bool network_up) {
   Send(new AwViewMsg_SetJsOnlineProperty(network_up));
 }
 
+void AwRenderViewHostExt::EnableContentsSizeNotifications() {
+  Send(new AwViewMsg_EnableContentsSizeNotifications(
+      web_contents()->GetRoutingID()));
+}
+
 void AwRenderViewHostExt::RenderViewCreated(
     content::RenderViewHost* render_view_host) {
   Send(new AwViewMsg_SetBackgroundColor(web_contents()->GetRoutingID(),
@@ -134,6 +139,8 @@ bool AwRenderViewHostExt::OnMessageReceived(const IPC::Message& message) {
                         OnUpdateHitTestData)
     IPC_MESSAGE_HANDLER(AwViewHostMsg_PageScaleFactorChanged,
                         OnPageScaleFactorChanged)
+    IPC_MESSAGE_HANDLER(AwViewHostMsg_OnContentsSizeChanged,
+                        OnContentsSizeChanged)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -164,4 +171,9 @@ void AwRenderViewHostExt::OnPageScaleFactorChanged(float page_scale_factor) {
   client_->OnWebLayoutPageScaleFactorChanged(page_scale_factor);
 }
 
+void AwRenderViewHostExt::OnContentsSizeChanged(
+    const gfx::Size& contents_size) {
+  client_->OnWebLayoutContentsSizeChanged(contents_size);
+}
+
 }  // namespace android_webview