Support exposing Mojo services between render frames, render threads, and their respective hosts.

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index ab32d9f767fcf9484a1f3bcc7632f7b80a9152e5..39657d20cd2175925333edb9bf3f6028604415bd 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -14,6 +14,7 @@
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
+#include "content/common/mojo/service_registry_impl.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/common/javascript_message_type.h"
 #include "content/public/common/page_transition_types.h"
@@ -66,6 +67,7 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
       const base::string16& javascript,
       const JavaScriptResultCallback& callback) OVERRIDE;
   virtual RenderViewHost* GetRenderViewHost() OVERRIDE;
+  virtual ServiceRegistry* GetServiceRegistry() OVERRIDE;
 
   // IPC::Sender
   virtual bool Send(IPC::Message* msg) OVERRIDE;
@@ -167,6 +169,10 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
   // Called when an HTML5 notification is closed.
   void NotificationClosed(int notification_id);
 
+  // Binds this render frame's service registry to a handle to the remote
+  // service registry.
+  void BindServiceRegistry(mojo::ScopedMessagePipeHandle shell_handle);

[darin (slow to review), 2014/06/12 05:27:12]

nit: shell_handle seems like the wrong parameter name here.

[Sam McNally, 2014/06/12 08:56:40]

Done.

+
  protected:
   friend class RenderFrameHostFactory;
 
@@ -290,6 +296,8 @@ class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
   // When the last BeforeUnload message was sent.
   base::TimeTicks send_before_unload_start_time_;
 
+  ServiceRegistryImpl service_registry_;
+
   base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);