Impl mus::mojom::GpuService to enable using Chrome IPC version gpu CmdBuf in mus

components/mus/public/cpp/lib/context_provider.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/public/cpp/context_provider.h"
 
 #include <stdint.h>
 
 #include "base/logging.h"
 #include "components/mus/public/cpp/gles2_context.h"
 
 namespace mus {
 
-ContextProvider::ContextProvider(
-    mojo::ScopedMessagePipeHandle command_buffer_handle)
-    : command_buffer_handle_(std::move(command_buffer_handle)),
-      context_(nullptr) {
-}
+ContextProvider::ContextProvider(shell::Connector* connector)
+    : connector_(connector) {}
 
 bool ContextProvider::BindToCurrentThread() {
-  mojom::CommandBufferPtr command_buffer_ptr;
-  command_buffer_ptr.Bind(mojo::InterfacePtrInfo<mus::mojom::CommandBuffer>(
-      std::move(command_buffer_handle_), 0u));
-  std::unique_ptr<GLES2Context> context(
-      new GLES2Context(std::vector<int32_t>(), std::move(command_buffer_ptr)));
-  if (context->Initialize())
-    context_ = std::move(context);
+  context_ =
+      GLES2Context::CreateOffscreenContext(std::vector<int32_t>(), connector_);

[sadrul, 2016/06/01 19:16:57]

Note that if |connector_| is coming from a different thread (which I believe is
the case with --use-mus-in-renderer), then this wouldn't work, and you would
need to Clone() the connector first (the clone needs to happen in the thread
|connector_| lives in)

[Peng, 2016/06/01 20:00:42]

Good catch. Done.

   return !!context_;
 }
 
 gpu::gles2::GLES2Interface* ContextProvider::ContextGL() {
   return context_->interface();
 }
 
 gpu::ContextSupport* ContextProvider::ContextSupport() {
   if (!context_)
     return NULL;
@@ skipping 17 matching lines @@
 base::Lock* ContextProvider::GetLock() {
   // This context provider is not used on multiple threads.
   NOTREACHED();
   return nullptr;
 }
 
 ContextProvider::~ContextProvider() {
 }
 
 }  // namespace mus