Browser Plugin: Add HTML5-like postMessage support

content/browser/browser_plugin/browser_plugin_embedder.cc

Index: content/browser/browser_plugin/browser_plugin_embedder.cc
diff --git a/content/browser/browser_plugin/browser_plugin_embedder.cc b/content/browser/browser_plugin/browser_plugin_embedder.cc
index 7adbe2b7cde5dd83c8d7499a108d040375f609c9..7aa5a2f7d7ae2efd2a6fb4c94346933b091a6102 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder.cc
+++ b/content/browser/browser_plugin/browser_plugin_embedder.cc
@@ -110,6 +110,14 @@ void BrowserPluginEmbedder::CreateGuest(RenderViewHost* render_view_host,
   guest_renderer_prefs->throttle_input_events = false;
   AddGuest(instance_id, guest_web_contents);
   guest_web_contents->SetDelegate(guest);
+
+  // Create a swapped out RenderView for the guest in the embedder render
+  // process, so that the embedder can access the guest's window object.
+  int guest_routing_id =
+      static_cast<WebContentsImpl*>(guest->GetWebContents())->
+            CreateSwappedOutRenderView(web_contents()->GetSiteInstance());
+  render_view_host->Send(new BrowserPluginMsg_GuestContentWindowReady(
+      instance_id, guest_routing_id));
 }
 
 void BrowserPluginEmbedder::NavigateGuest(
@@ -132,7 +140,7 @@ void BrowserPluginEmbedder::NavigateGuest(
     // TODO(creis): Check the validity of the URL: http://crbug.com/139397.
     guest_web_contents->GetController().LoadURL(url,
                                                 Referrer(),
-                                                PAGE_TRANSITION_AUTO_SUBFRAME,
+                                                PAGE_TRANSITION_AUTO_TOPLEVEL,
                                                 std::string());
   }
 
@@ -244,7 +252,6 @@ void BrowserPluginEmbedder::DestroyGuestByInstanceID(int instance_id) {
 
 void BrowserPluginEmbedder::RenderViewDeleted(
     RenderViewHost* render_view_host) {
-  DestroyGuests();
 }
 
 void BrowserPluginEmbedder::RenderViewGone(base::TerminationStatus status) {