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

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 0935110406af3f46be3823d3acfdccf37ac1af2a..5e0158eafd5fb068ccd0105ca0f6b5b6043d582c 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -68,7 +68,6 @@
 #include "content/browser/media/midi_host.h"
 #include "content/browser/message_port_message_filter.h"
 #include "content/browser/mime_registry_message_filter.h"
-#include "content/browser/mojo/mojo_application_host.h"
 #include "content/browser/plugin_service_impl.h"
 #include "content/browser/profiler_message_filter.h"
 #include "content/browser/push_messaging_message_filter.h"
@@ -140,7 +139,6 @@
 #include "ipc/ipc_logging.h"
 #include "ipc/ipc_switches.h"
 #include "media/base/media_switches.h"
-#include "mojo/common/common_type_converters.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "ppapi/shared_impl/ppapi_switches.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ -447,6 +445,7 @@ RenderProcessHostImpl::RenderProcessHostImpl(
       is_self_deleted_(false),
 #endif
       pending_views_(0),
+      mojo_application_host_(new MojoApplicationHost),
       mojo_activation_required_(false),
       visible_widgets_(0),
       backgrounded_(true),
@@ -596,7 +595,6 @@ bool RenderProcessHostImpl::Init() {
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get());
 
   // Setup the Mojo channel.
-  mojo_application_host_.reset(new MojoApplicationHost());
   mojo_application_host_->Init();
 
   // Call the embedder first so that their IPC filters have priority.
@@ -907,6 +905,12 @@ void RenderProcessHostImpl::NotifyTimezoneChange() {
   Send(new ViewMsg_TimezoneChange());
 }
 
+ServiceRegistry* RenderProcessHostImpl::GetServiceRegistry() {
+  if (!mojo_application_host_)
+    return NULL;
+  return mojo_application_host_->service_registry();
+}
+
 void RenderProcessHostImpl::AddRoute(
     int32 routing_id,
     IPC::Listener* listener) {
@@ -1935,7 +1939,8 @@ void RenderProcessHostImpl::ProcessDied(bool already_dead) {
     iter.Advance();
   }
 
-  mojo_application_host_.reset();
+  mojo_application_host_.reset(new MojoApplicationHost);
+  mojo_activation_required_ = false;
 
   // It's possible that one of the calls out to the observers might have caused
   // this object to be no longer needed.
@@ -2255,17 +2260,9 @@ void RenderProcessHostImpl::DecrementWorkerRefCount() {
     Cleanup();
 }
 
-void RenderProcessHostImpl::ConnectTo(
-    const base::StringPiece& service_name,
-    mojo::ScopedMessagePipeHandle handle) {
+void RenderProcessHostImpl::EnsureMojoActivated() {
   mojo_activation_required_ = true;
   MaybeActivateMojo();
-
-  mojo_application_host_->service_provider()->ConnectToService(
-      mojo::String::From(service_name),
-      std::string(),
-      handle.Pass(),
-      mojo::String());
 }
 
 void RenderProcessHostImpl::OnAllocateGpuMemoryBuffer(uint32 width,