<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 cc4aa3a52ee2087146e53588485e92b3daf8a331..c7f4eded5efa9f7848bfbea459f8a6ebeec2ce19 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;