Add a mojo implementation of AudioOutputIPC.

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 5991bde2b7d391a939795b39bcf23c865611d58f..5505afa585356260c1d78f4589370ab23bf02698 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -62,6 +62,7 @@
 #include "content/common/frame_owner_properties.h"
 #include "content/common/frame_replication_state.h"
 #include "content/common/input_messages.h"
+#include "content/common/media/renderer_audio_output_stream_factory.mojom.h"
 #include "content/common/navigation_params.h"
 #include "content/common/page_messages.h"
 #include "content/common/savable_subframe.h"
@@ -114,6 +115,7 @@
 #include "content/renderer/internal_document_state_data.h"
 #include "content/renderer/manifest/manifest_manager.h"
 #include "content/renderer/media/audio_device_factory.h"
+#include "content/renderer/media/audio_ipc_factory.h"
 #include "content/renderer/media/media_devices_listener_impl.h"
 #include "content/renderer/media/media_permission_dispatcher.h"
 #include "content/renderer/media/media_stream_dispatcher.h"
@@ -1220,6 +1222,12 @@ RenderFrameImpl::~RenderFrameImpl() {
   if (input_handler_manager)
     input_handler_manager->UnregisterRoutingID(GetRoutingID());
 
+  if (base::FeatureList::IsEnabled(

[o1ka, 2017/04/20 10:36:00]

Hide register/deregister logic in static methods of AudioIPCFactory?

[Max Morin, 2017/05/05 13:10:59]

Done.

+          features::kUseMojoAudioOutputStreamFactory) &&
+      render_thread) {
+    AudioIPCFactory::get()->DeregisterRemoteFactory(GetRoutingID());
+  }
+
   if (is_main_frame_) {
     // Ensure the RenderView doesn't point to this object, once it is destroyed.
     // TODO(nasko): Add a check that the |main_render_frame_| of |render_view_|
@@ -1293,6 +1301,15 @@ void RenderFrameImpl::Initialize() {
         GetRoutingID(), render_view_->GetRoutingID());
   }
 
+  if (base::FeatureList::IsEnabled(
+          features::kUseMojoAudioOutputStreamFactory) &&
+      render_thread) {
+    mojom::RendererAudioOutputStreamFactoryPtr factory_ptr;
+    GetRemoteInterfaces()->GetInterface(&factory_ptr);
+    AudioIPCFactory::get()->RegisterRemoteFactory(GetRoutingID(),
+                                                  std::move(factory_ptr));
+  }
+
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kDomAutomationController))