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

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 1866bb8b33105056a6b1fbb2698d9010aef8f515..892c10043a653306eceb8260d1310f18faebab01 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -30,6 +30,7 @@
 #include "content/common/clipboard_messages.h"
 #include "content/common/frame_messages.h"
 #include "content/common/input_messages.h"
+#include "content/common/render_frame_setup.mojom.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "content/common/socket_stream_handle_data.h"
 #include "content/common/swapped_out_messages.h"
@@ -435,6 +436,8 @@ RenderFrameImpl::RenderFrameImpl(RenderViewImpl* render_view, int routing_id)
 #if defined(ENABLE_NOTIFICATIONS)
   notification_provider_ = new NotificationProvider(this);
 #endif
+
+  InitializeServiceRegistry();
 }
 
 RenderFrameImpl::~RenderFrameImpl() {
@@ -1344,6 +1347,10 @@ void RenderFrameImpl::ExecuteJavaScript(const base::string16& javascript) {
   OnJavaScriptExecuteRequest(javascript, 0, false);
 }
 
+ServiceRegistry* RenderFrameImpl::GetServiceRegistry() {
+  return &service_registry_;
+}
+
 void RenderFrameImpl::OnChildFrameProcessGone() {
   if (compositing_helper_)
     compositing_helper_->ChildFrameGone();
@@ -3578,4 +3585,16 @@ RendererCdmManager* RenderFrameImpl::GetCdmManager() {
 
 #endif  // defined(OS_ANDROID)
 
+void RenderFrameImpl::InitializeServiceRegistry() {
+  if (!RenderThread::Get()->GetServiceRegistry())
+    return;
+
+  RenderFrameSetupPtr setup;
+  RenderThread::Get()->GetServiceRegistry()->GetInterface(&setup);
+  mojo::IInterfaceProviderPtr interface_provider;
+  setup->ConnectToInterfaceProvider(routing_id_,
+                                    mojo::Get(&interface_provider));
+  service_registry_.Bind(interface_provider.PassMessagePipe());
+}
+
 }  // namespace content