Enable sync allocation of GpuMemoryBuffers from the browser process.

content/browser/gpu/gpu_memory_buffer_factory_host_impl.cc

+// Copyright (c) 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 "content/browser/gpu/gpu_memory_buffer_factory_host_impl.h"
+
+#include "base/bind.h"
+#include "content/browser/gpu/gpu_process_host.h"
+#include "content/public/browser/browser_thread.h"
+#include "ui/gfx/gpu_memory_buffer.h"
+
+namespace content {
+
+GpuMemoryBufferFactoryHostImpl::GpuMemoryBufferFactoryHostImpl()
+    : gpu_host_id_(0), next_create_gpu_memory_buffer_request_id_(0) {
+}
+
+GpuMemoryBufferFactoryHostImpl::~GpuMemoryBufferFactoryHostImpl() {
+}
+
+void GpuMemoryBufferFactoryHostImpl::CreateGpuMemoryBuffer(
+    const gfx::GpuMemoryBufferHandle& handle,
+    const gfx::Size& size,
+    unsigned internalformat,
+    unsigned usage,
+    const CreateGpuMemoryBufferCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  GpuProcessHost* host = GpuProcessHost::FromID(gpu_host_id_);
+  if (!host) {
+    callback.Run(gfx::GpuMemoryBufferHandle());
+    return;
+  }
+
+  uint32 request_id = next_create_gpu_memory_buffer_request_id_++;
+  create_gpu_memory_buffer_requests_[request_id] = callback;
+
+  host->CreateGpuMemoryBuffer(
+      handle,
+      size,
+      internalformat,
+      usage,
+      base::Bind(&GpuMemoryBufferFactoryHostImpl::OnGpuMemoryBufferCreated,
+                 base::Unretained(this),
+                 request_id));
+}
+
+void GpuMemoryBufferFactoryHostImpl::DestroyGpuMemoryBuffer(
+    const gfx::GpuMemoryBufferHandle& handle,
+    int32 sync_point) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  GpuProcessHost* host = GpuProcessHost::FromID(gpu_host_id_);
+  if (!host)
+    return;
+
+  host->DestroyGpuMemoryBuffer(handle, sync_point);
+}
+
+void GpuMemoryBufferFactoryHostImpl::OnGpuMemoryBufferCreated(
+    uint32 request_id,
+    const gfx::GpuMemoryBufferHandle& handle) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  CreateGpuMemoryBufferCallbackMap::iterator iter =
+      create_gpu_memory_buffer_requests_.find(request_id);
+  DCHECK(iter != create_gpu_memory_buffer_requests_.end());
+  iter->second.Run(handle);
+  create_gpu_memory_buffer_requests_.erase(iter);
+}
+
+}  // namespace content