Very basic Android browser-side compositing support.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index a14bf00b396de805ab673a83de700799769fe16d..7bb35843e12e4d857a9e2182c64a2c2e47a905b7 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1438,6 +1438,18 @@ void WebContentsImpl::RequestMediaAccessPermission(
     callback.Run(content::MediaStreamDevices());
 }
 
+#if defined(OS_ANDROID)
+void WebContentsImpl::AttachLayer(WebKit::WebLayer* layer) {
+  if (delegate_)
+    delegate_->AttachLayer(this, layer);
+}
+
+void WebContentsImpl::RemoveLayer(WebKit::WebLayer* layer) {
+  if (delegate_)
+    delegate_->RemoveLayer(this, layer);
+}
+#endif
+
 void WebContentsImpl::UpdatePreferredSize(const gfx::Size& pref_size) {
   preferred_size_ = pref_size;
   if (delegate_)