Add a GpuMemoryBuffer pool that creates hardware backed VideoFrames.

media/renderers/mock_gpu_video_accelerator_factories.cc

Index: media/renderers/mock_gpu_video_accelerator_factories.cc
diff --git a/media/renderers/mock_gpu_video_accelerator_factories.cc b/media/renderers/mock_gpu_video_accelerator_factories.cc
index c9f7824424cd6889cec388aa93d45f78d761b660..8dda0b2420ca040d7d3cbdd5de49f45a79f1c77a 100644
--- a/media/renderers/mock_gpu_video_accelerator_factories.cc
+++ b/media/renderers/mock_gpu_video_accelerator_factories.cc
@@ -4,12 +4,58 @@
 
 #include "media/renderers/mock_gpu_video_accelerator_factories.h"
 
+#include "ui/gfx/gpu_memory_buffer.h"
+
 namespace media {
 
+namespace {
+
+class GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
+ public:
+  GpuMemoryBufferImpl(const gfx::Size& size) : size_(size) {
+    bytes_.resize(size_.GetArea());
+  }
+
+  // Overridden from gfx::GpuMemoryBuffer:
+  bool Map(void** data) override {
+    data[0] = &bytes_[0];
+    return true;
+  }
+  void Unmap() override{};
+  bool IsMapped() const override {
+    NOTREACHED();
+    return false;
+  }
+  Format GetFormat() const override { return gfx::GpuMemoryBuffer::R_8; }
+  void GetStride(int* stride) const override { stride[0] = size_.width(); }
+  gfx::GpuMemoryBufferHandle GetHandle() const override {
+    NOTREACHED();
+    return gfx::GpuMemoryBufferHandle();
+  }
+  ClientBuffer AsClientBuffer() override {
+    return reinterpret_cast<ClientBuffer>(this);
+  }
+
+ private:
+  std::vector<unsigned char> bytes_;
+  const gfx::Size size_;
+};
+
+}  // unnamed namespace
+
 MockGpuVideoAcceleratorFactories::MockGpuVideoAcceleratorFactories() {}
 
 MockGpuVideoAcceleratorFactories::~MockGpuVideoAcceleratorFactories() {}
 
+scoped_ptr<gfx::GpuMemoryBuffer>
+MockGpuVideoAcceleratorFactories::AllocateGpuMemoryBuffer(
+    const gfx::Size& size,
+    gfx::GpuMemoryBuffer::Format format,
+    gfx::GpuMemoryBuffer::Usage usage) {
+  DCHECK_EQ(gfx::GpuMemoryBuffer::R_8, format);
+  return make_scoped_ptr<gfx::GpuMemoryBuffer>(new GpuMemoryBufferImpl(size));
+}
+
 scoped_ptr<base::SharedMemory>
 MockGpuVideoAcceleratorFactories::CreateSharedMemory(size_t size) {
   return nullptr;