Blimp: create Mojo component for renderer/browser communication.

blimp/engine/app/blimp_content_renderer_client.cc

Index: blimp/engine/app/blimp_content_renderer_client.cc
diff --git a/blimp/engine/app/blimp_content_renderer_client.cc b/blimp/engine/app/blimp_content_renderer_client.cc
index 9b9b40a5874dbbc99ed00b7d0b1b08ec9096540a..9e2e44c25dcc4965cb1c768e73df8d78c14f2c9b 100644
--- a/blimp/engine/app/blimp_content_renderer_client.cc
+++ b/blimp/engine/app/blimp_content_renderer_client.cc
@@ -5,20 +5,34 @@
 #include "blimp/engine/app/blimp_content_renderer_client.h"
 
 #include "blimp/common/compositor/blimp_image_serialization_processor.h"
+#include "blimp/engine/mojo/blob_channel.mojom.h"
+#include "blimp/engine/renderer/engine_image_serialization_processor.h"
 #include "components/web_cache/renderer/web_cache_render_process_observer.h"
+#include "content/public/common/service_registry.h"
+#include "content/public/renderer/render_thread.h"
 
 namespace blimp {
 namespace engine {
-
-BlimpContentRendererClient::BlimpContentRendererClient(
-    scoped_ptr<BlimpImageSerializationProcessor> image_serialization_processor)
-    : image_serialization_processor_(std::move(image_serialization_processor)) {
+namespace {
+
+BlobChannelMojoPtr GetConnectedBlobChannel() {

[nyquist, 2016/04/05 22:13:19]

Is this call blocking across the renderer and browser process?

[Kevin M, 2016/04/06 00:01:44]

The renderer: yes (at startup), the browser: no. The handshake is practically
instantaneous even when the Mojo connection is cold.

+  BlobChannelMojoPtr blob_channel_ptr;
+  content::RenderThread::Get()->GetServiceRegistry()->ConnectToRemoteService(
+      mojo::GetProxy(&blob_channel_ptr));
+  DCHECK(blob_channel_ptr);
+  return blob_channel_ptr;
 }
 
+}  // namespace
+
+BlimpContentRendererClient::BlimpContentRendererClient() {}
+
 BlimpContentRendererClient::~BlimpContentRendererClient() {}
 
 void BlimpContentRendererClient::RenderThreadStarted() {
   web_cache_observer_.reset(new web_cache::WebCacheRenderProcessObserver());
+  image_serialization_processor_.reset(
+      new EngineImageSerializationProcessor(GetConnectedBlobChannel()));
 }
 
 cc::ImageSerializationProcessor*