Introduce Display Compositor mojo interface. Use InProcessContextProvider.

services/ui/ws/gpu_service_proxy.cc

Index: services/ui/ws/gpu_service_proxy.cc
diff --git a/services/ui/ws/gpu_service_proxy.cc b/services/ui/ws/gpu_service_proxy.cc
index 64441648ff8fd8728849e5bdd3c149dac1871c90..2de1df2b3d6c4c64cc9938576869e7454693f6a8 100644
--- a/services/ui/ws/gpu_service_proxy.cc
+++ b/services/ui/ws/gpu_service_proxy.cc
@@ -14,7 +14,6 @@
 #include "mojo/public/cpp/system/platform_handle.h"
 #include "services/service_manager/public/cpp/connection.h"
 #include "services/ui/ws/gpu_service_proxy_delegate.h"
-#include "services/ui/ws/mus_gpu_memory_buffer_manager.h"
 #include "ui/gfx/buffer_format_util.h"
 
 namespace ui {
@@ -22,8 +21,8 @@ namespace ws {
 
 namespace {
 
-const int32_t kInternalGpuChannelClientId = 1;
-const uint64_t kInternalGpuChannelClientTracingId = 1;
+// The client Id 1 is reserved for the display compositor.
+const int32_t kInternalGpuChannelClientId = 2;
 
 }  // namespace
 
@@ -50,31 +49,22 @@ void GpuServiceProxy::Add(mojom::GpuServiceRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
+void GpuServiceProxy::CreateDisplayCompositor(
+    cc::mojom::DisplayCompositorRequest request,
+    cc::mojom::DisplayCompositorClientPtr client) {
+  gpu_service_->CreateDisplayCompositor(std::move(request), std::move(client));
+}
+
 void GpuServiceProxy::OnInitialized(const gpu::GPUInfo& gpu_info) {
   gpu_info_ = gpu_info;
 
-  constexpr bool is_gpu_host = true;
-  gpu_service_->EstablishGpuChannel(
-      kInternalGpuChannelClientId, kInternalGpuChannelClientTracingId,
-      is_gpu_host, base::Bind(&GpuServiceProxy::OnInternalGpuChannelEstablished,
-                             base::Unretained(this)));
-}
-
-void GpuServiceProxy::OnInternalGpuChannelEstablished(
-    mojo::ScopedMessagePipeHandle channel_handle) {
+  // TODO(fsamuel): What is this thread used for?

[sadrul, 2016/11/21 17:23:49]

See comment in .h

[Fady Samuel, 2016/11/21 20:40:41]

Deleted.

   io_thread_ = base::MakeUnique<base::Thread>("GPUIOThread");
   base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
   thread_options.priority = base::ThreadPriority::NORMAL;
   CHECK(io_thread_->StartWithOptions(thread_options));
 
-  gpu_memory_buffer_manager_ = base::MakeUnique<MusGpuMemoryBufferManager>(
-      gpu_service_.get(), kInternalGpuChannelClientId);
-  gpu_channel_ = gpu::GpuChannelHost::Create(
-      this, kInternalGpuChannelClientId, gpu_info_,
-      IPC::ChannelHandle(channel_handle.release()), &shutdown_event_,
-      gpu_memory_buffer_manager_.get());
-  if (delegate_)
-    delegate_->OnGpuChannelEstablished(gpu_channel_);
+  delegate_->OnGpuServiceInitialized();
 }
 
 void GpuServiceProxy::OnGpuChannelEstablished(