<webview>: Make contentWindow available prior to attachment (on display:none).

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 c506402d6a36320a3e91a93e24f55722b7b9fa29..685ed049421f373c2a7f7fc182f2cbaf9e1e5fad 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -153,6 +153,10 @@ class CONTENT_EXPORT WebContentsImpl
   // an embedder.
   BrowserPluginEmbedder* GetBrowserPluginEmbedder() const;
 
+  // Creates a BrowserPluginEmbedder object for this WebContents if one doesn't
+  // already exist.
+  void CreateBrowserPluginEmbedderIfNecessary();
+
   // Gets the current fullscreen render widget's routing ID. Returns
   // MSG_ROUTING_NONE when there is no fullscreen render widget.
   int GetFullscreenWidgetRoutingID() const;