Use enum instead of string in MessageLoopFactory::GetMessageLoop*

content/renderer/media/renderer_gpu_video_decoder_factories.cc

 // Copyright (c) 2012 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 "content/renderer/media/renderer_gpu_video_decoder_factories.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "base/bind.h"
 #include "base/synchronization/waitable_event.h"
 #include "content/common/child_thread.h"
 #include "content/common/gpu/client/gpu_channel_host.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/ipc/command_buffer_proxy.h"
 
 RendererGpuVideoDecoderFactories::~RendererGpuVideoDecoderFactories() {}
 RendererGpuVideoDecoderFactories::RendererGpuVideoDecoderFactories(
-    GpuChannelHost* gpu_channel_host, MessageLoop* message_loop,
+    GpuChannelHost* gpu_channel_host,
+    const scoped_refptr<base::MessageLoopProxy>& message_loop,
     const base::WeakPtr<WebGraphicsContext3DCommandBufferImpl>& context)
     : message_loop_(message_loop),
       gpu_channel_host_(gpu_channel_host),
       context_(context) {
   DCHECK(context_);
   context_->DetachFromThread();
-  if (MessageLoop::current() == message_loop_) {
+  if (message_loop_->BelongsToCurrentThread()) {
     AsyncGetContext(NULL);
     return;
   }
   // Threaded compositor requires us to wait for the context to be acquired.
   base::WaitableEvent waiter(false, false);
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &RendererGpuVideoDecoderFactories::AsyncGetContext,
       // Unretained to avoid ref/deref'ing |*this|, which is not yet stored in a
       // scoped_refptr.  Safe because the Wait() below keeps us alive until this
       // task completes.
       base::Unretained(this), &waiter));
   waiter.Wait();
 }
 
 void RendererGpuVideoDecoderFactories::AsyncGetContext(
     base::WaitableEvent* waiter) {
   if (context_)
     context_->makeContextCurrent();
   if (waiter)
     waiter->Signal();
 }
 
 media::VideoDecodeAccelerator*
 RendererGpuVideoDecoderFactories::CreateVideoDecodeAccelerator(
     media::VideoCodecProfile profile,
     media::VideoDecodeAccelerator::Client* client) {
-  DCHECK_NE(MessageLoop::current(), message_loop_);
+  DCHECK(!message_loop_->BelongsToCurrentThread());
   media::VideoDecodeAccelerator* vda = NULL;
   base::WaitableEvent waiter(false, false);
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &RendererGpuVideoDecoderFactories::AsyncCreateVideoDecodeAccelerator,
       this, profile, client, &vda, &waiter));
   waiter.Wait();
   return vda;
 }
 
 void RendererGpuVideoDecoderFactories::AsyncCreateVideoDecodeAccelerator(
       media::VideoCodecProfile profile,
       media::VideoDecodeAccelerator::Client* client,
       media::VideoDecodeAccelerator** vda,
       base::WaitableEvent* waiter) {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
+  DCHECK(message_loop_->BelongsToCurrentThread());
   if (context_ && context_->GetCommandBufferProxy()) {
     *vda = gpu_channel_host_->CreateVideoDecoder(
         context_->GetCommandBufferProxy()->GetRouteID(),
         profile, client);
   } else {
     *vda = NULL;
   }
   waiter->Signal();
 }
 
 bool RendererGpuVideoDecoderFactories::CreateTextures(
     int32 count, const gfx::Size& size,
     std::vector<uint32>* texture_ids,
     uint32 texture_target) {
-  DCHECK_NE(MessageLoop::current(), message_loop_);
+  DCHECK(!message_loop_->BelongsToCurrentThread());
   bool success = false;
   base::WaitableEvent waiter(false, false);
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &RendererGpuVideoDecoderFactories::AsyncCreateTextures, this,
       count, size, texture_ids, texture_target, &success, &waiter));
   waiter.Wait();
   return success;
 }
 
 void RendererGpuVideoDecoderFactories::AsyncCreateTextures(
     int32 count, const gfx::Size& size, std::vector<uint32>* texture_ids,
     uint32 texture_target, bool* success, base::WaitableEvent* waiter) {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
+  DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK(texture_target);
   if (!context_) {
     *success = false;
     waiter->Signal();
     return;
   }
   gpu::gles2::GLES2Implementation* gles2 = context_->GetImplementation();
   texture_ids->resize(count);
   gles2->GenTextures(count, &texture_ids->at(0));
   for (int i = 0; i < count; ++i) {
@@ skipping 12 matching lines @@
   // We need a glFlush here to guarantee the decoder (in the GPU process) can
   // use the texture ids we return here.  Since textures are expected to be
   // reused, this should not be unacceptably expensive.
   gles2->Flush();
   DCHECK_EQ(gles2->GetError(), static_cast<GLenum>(GL_NO_ERROR));
   *success = true;
   waiter->Signal();
 }
 
 void RendererGpuVideoDecoderFactories::DeleteTexture(uint32 texture_id) {
-  DCHECK_NE(MessageLoop::current(), message_loop_);
+  DCHECK(!message_loop_->BelongsToCurrentThread());
   message_loop_->PostTask(FROM_HERE, base::Bind(
       &RendererGpuVideoDecoderFactories::AsyncDeleteTexture, this, texture_id));
 }
 
 void RendererGpuVideoDecoderFactories::AsyncDeleteTexture(uint32 texture_id) {
-  DCHECK_EQ(MessageLoop::current(), message_loop_);
+  DCHECK(message_loop_->BelongsToCurrentThread());
   if (!context_)
     return;
   gpu::gles2::GLES2Implementation* gles2 = context_->GetImplementation();
   gles2->DeleteTextures(1, &texture_id);
   DCHECK_EQ(gles2->GetError(), static_cast<GLenum>(GL_NO_ERROR));
 }
 
 base::SharedMemory* RendererGpuVideoDecoderFactories::CreateSharedMemory(
     size_t size) {
   DCHECK_NE(MessageLoop::current(), ChildThread::current()->message_loop());
   base::SharedMemory* shm = NULL;
   base::WaitableEvent waiter(false, false);
   ChildThread::current()->message_loop()->PostTask(FROM_HERE, base::Bind(
       &RendererGpuVideoDecoderFactories::AsyncCreateSharedMemory, this,
       size, &shm, &waiter));
   waiter.Wait();
   return shm;
 }
 
 void RendererGpuVideoDecoderFactories::AsyncCreateSharedMemory(
     size_t size, base::SharedMemory** shm, base::WaitableEvent* waiter) {
   DCHECK_EQ(MessageLoop::current(), ChildThread::current()->message_loop());
   *shm = ChildThread::current()->AllocateSharedMemory(size);
   waiter->Signal();
 }