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

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 a83ec56e45ef6a8ecf6b936e52df9d40dc44fdb5..1dcdecc0adb44a2a2bcd9f412aee31e87eb5b834 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -3168,13 +3168,8 @@ void WebContentsImpl::OnPpapiBrokerPermissionResult(int routing_id,
 
 void WebContentsImpl::OnBrowserPluginMessage(RenderFrameHost* render_frame_host,
                                              const IPC::Message& message) {
-  // This creates a BrowserPluginEmbedder, which handles all the BrowserPlugin
-  // specific messages for this WebContents. This means that any message from
-  // a BrowserPlugin prior to this will be ignored.
-  // For more info, see comment above classes BrowserPluginEmbedder and
-  // BrowserPluginGuest.
   CHECK(!browser_plugin_embedder_.get());
-  browser_plugin_embedder_.reset(BrowserPluginEmbedder::Create(this));
+  CreateBrowserPluginEmbedderIfNecessary();
   browser_plugin_embedder_->OnMessageReceived(message, render_frame_host);
 }
 #endif  // defined(ENABLE_PLUGINS)
@@ -4458,6 +4453,12 @@ BrowserPluginEmbedder* WebContentsImpl::GetBrowserPluginEmbedder() const {
   return browser_plugin_embedder_.get();
 }
 
+void WebContentsImpl::CreateBrowserPluginEmbedderIfNecessary() {
+  if (browser_plugin_embedder_)
+    return;
+  browser_plugin_embedder_.reset(BrowserPluginEmbedder::Create(this));
+}
+
 void WebContentsImpl::ClearPowerSaveBlockers(
     RenderFrameHost* render_frame_host) {
   RemoveAllMediaPlayerEntries(render_frame_host, &active_audio_players_);