Add service registration for Mojo services defined under chrome/

chrome/browser/extensions/chrome_extension_web_contents_observer.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 
+#include "chrome/browser/extensions/chrome_mojo_service_registry.h"
 #include "chrome/browser/extensions/error_console/error_console.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/common/extensions/chrome_extension_messages.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension_messages.h"
 #include "extensions/common/extension_urls.h"
@@ skipping 67 matching lines @@
   // Reload the extension if it has crashed.
   // TODO(yoz): This reload doesn't happen synchronously for unpacked
   //            extensions. It seems to be fast enough, but there is a race.
   //            We should delay loading until the extension has reloaded.
   if (registry->GetExtensionById(extension_id, ExtensionRegistry::TERMINATED)) {
     ExtensionSystem::Get(browser_context())->
         extension_service()->ReloadExtension(extension_id);
   }
 }
 
+void ChromeExtensionWebContentsObserver::RegisterMojoServices(
+    content::RenderFrameHost* render_frame_host,

[mark a. foltz, 2015/03/27 20:24:11]

What is the relationship between |render_frame_host| and the |web_contents| that
this observer is instantiated with?

[Kevin M, 2015/03/27 22:42:37]

render_frame_host is created as a result of |web_contents| constructing a
RenderView. The RenderFrameCreated observer method is invoked after
render_frame_host is created.

+    const Extension* extension) {
+  DCHECK(render_frame_host);
+  DCHECK(extension);
+
+  ExtensionWebContentsObserver::RegisterMojoServices(render_frame_host,
+                                                     extension);
+
+  RegisterChromeServicesForFrame(render_frame_host, extension);
+}
+
 }  // namespace extensions