chromeos: Add SurfaceServiceProvider.

ash/surfaces/surface_controller.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 "ash/surfaces/surface_controller.h"
+
+#include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
+#include "ui/aura/env.h"
+#include "ui/compositor/compositor.h"
+
+namespace ash {
+
+SurfaceController::SurfaceController()
+    : next_buffer_(1), test_surface_buffer_(0) {}
+
+SurfaceController::~SurfaceController() {}
+
+void SurfaceController::AddObserver(Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void SurfaceController::RemoveObserver(Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void SurfaceController::CreateGraphicsBufferFromGpuMemoryBufferHandle(
+    const gfx::GpuMemoryBufferHandle& handle,
+    const gfx::Size& size,
+    gfx::BufferFormat format,
+    const GraphicsBufferCreatedCallback& callback) {
+  int32 new_buffer = next_buffer_++;
+
+  // TODO(reveman): Expose GpuMemoryBufferManager's asynchronous API.
+  scoped_ptr<gfx::GpuMemoryBuffer> gpu_memory_buffer =
+      aura::Env::GetInstance()
+          ->context_factory()
+          ->GetGpuMemoryBufferManager()
+          ->CreateGpuMemoryBufferFromHandle(handle, size, format);
+  if (!gpu_memory_buffer) {
+    callback.Run(0);
+    return;
+  }
+
+  DCHECK(gpu_memory_buffers_.find(new_buffer) == gpu_memory_buffers_.end());
+  gpu_memory_buffers_.set(new_buffer, gpu_memory_buffer.Pass());
+
+  callback.Run(new_buffer);
+}
+
+void SurfaceController::DestroyGraphicsBuffer(int32 buffer) {
+  DCHECK(gpu_memory_buffers_.find(buffer) != gpu_memory_buffers_.end());
+  gpu_memory_buffers_.erase(buffer);
+}
+
+void SurfaceController::SetTestSurfaceContents(int32 buffer) {
+  test_surface_buffer_ = buffer;
+  FOR_EACH_OBSERVER(Observer, observers_,
+                    OnTestSurfaceGpuMemoryBufferChanged());
+}
+
+gfx::GpuMemoryBuffer* SurfaceController::GetTestSurfaceGpuMemoryBuffer() const {
+  return gpu_memory_buffers_.get(test_surface_buffer_);
+}
+
+}  // namespace ash