Implement GpuArcVideoService for arc video accelerator

content/common/gpu/client/gpu_arc_accelerator_host.cc

+// Copyright 2015 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/common/gpu/client/gpu_arc_accelerator_host.h"
+
+#include "base/logging.h"
+#include "base/message_loop/message_loop.h"
+#include "content/browser/gpu/browser_gpu_channel_host_factory.h"
+#include "content/common/gpu/client/gpu_channel_host.h"
+#include "content/common/gpu/gpu_messages.h"
+#include "content/public/browser/browser_thread.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+
+namespace content {
+
+GpuArcAcceleratorHost::GpuArcAcceleratorHost() : route_id_(MSG_ROUTING_NONE) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+}
+
+GpuArcAcceleratorHost::~GpuArcAcceleratorHost() {
+  DCHECK(CalledOnValidThread());
+}
+
+bool GpuArcAcceleratorHost::OnMessageReceived(const IPC::Message& msg) {
+  DCHECK(CalledOnValidThread());
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(GpuArcAcceleratorHost, msg)
+    IPC_MESSAGE_HANDLER(GpuHostMsg_ArcAcceleratorCreated,
+                        OnArcAcceleratorCreated)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  DCHECK(handled);
+  return handled;
+}
+
+void GpuArcAcceleratorHost::OnChannelError() {
+  AbortPendingRequests();
+}
+
+void GpuArcAcceleratorHost::CreateArcAccelerator(uint32_t device_type,
+                                                 const CreatedCallback& cb) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(BrowserGpuChannelHostFactory::instance());
+
+  if (gpu_channel_host_ && !gpu_channel_host_->IsLost()) {
+    CreateArcAcceleratorWithGpuChannel(device_type, cb);
+    return;
+  }
+
+  BrowserGpuChannelHostFactory::instance()->EstablishGpuChannel(
+      CAUSE_FOR_GPU_LAUNCH_ARCACCELERATOR,
+      base::Bind(&GpuArcAcceleratorHost::GpuChannelEstablished, AsWeakPtr(),
+                 device_type, cb));
+}
+
+void GpuArcAcceleratorHost::GpuChannelEstablished(uint32_t device_type,
+                                                  const CreatedCallback& cb) {
+  DCHECK(CalledOnValidThread());
+  DCHECK_EQ(MSG_ROUTING_NONE, route_id_);
+
+  gpu_channel_host_ = BrowserGpuChannelHostFactory::instance()->GetGpuChannel();
+  route_id_ = gpu_channel_host_->GenerateRouteID();
+  gpu_channel_host_->AddRoute(route_id_, AsWeakPtr());
+
+  CreateArcAcceleratorWithGpuChannel(device_type, cb);
+}
+
+void GpuArcAcceleratorHost::CreateArcAcceleratorWithGpuChannel(
+    uint32_t device_type,
+    const CreatedCallback& cb) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(gpu_channel_host_);
+  DCHECK(!gpu_channel_host_->IsLost());
+
+  pending_requests_.push(cb);
+  if (!gpu_channel_host_->Send(new GpuMsg_CreateArcAccelerator(device_type)))
+    AbortPendingRequests();
+}
+
+void GpuArcAcceleratorHost::AbortPendingRequests() {
+  DCHECK(CalledOnValidThread());
+  if (gpu_channel_host_) {
+    DCHECK_NE(MSG_ROUTING_NONE, route_id_);
+    gpu_channel_host_->RemoveRoute(route_id_);
+    gpu_channel_host_ = nullptr;
+    route_id_ = MSG_ROUTING_NONE;
+  }
+  while (!pending_requests_.empty()) {
+    pending_requests_.front().Run(IPC::ChannelHandle(), 0);

[Owen Lin, 2015/11/26 03:54:40]

I thought result "0" means success, but it is actually aborted.

[kcwu, 2015/11/26 10:34:42]

Acknowledged.

+    pending_requests_.pop();
+  }
+}
+
+void GpuArcAcceleratorHost::Shutdown() {
+  if (gpu_channel_host_ && !gpu_channel_host_->IsLost())
+    gpu_channel_host_->Send(new GpuMsg_ShutdownArcAccelerators());
+  AbortPendingRequests();
+}
+
+void GpuArcAcceleratorHost::OnArcAcceleratorCreated(IPC::ChannelHandle handle,
+                                                    uint32_t result) {
+  DCHECK(CalledOnValidThread());
+
+  if (pending_requests_.empty()) {
+    // Maybe got reply after error or Shutdown().
+    LOG(WARNING) << "Arc accelerator created but no pending requests.";
+    return;
+  }
+
+  // The order of response messages must match the order of request messages.
+  // XXX(figure out before commit) Does this guarantee?
+  pending_requests_.front().Run(handle, result);
+  pending_requests_.pop();
+}
+
+}  // namespace content