Deal with AllocateGpuMemoryBuffer returning null.

media/video/gpu_memory_buffer_video_frame_pool_unittest.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 "base/bind.h"
 #include "base/test/test_simple_task_runner.h"
 #include "gpu/command_buffer/client/gles2_interface_stub.h"
 #include "media/base/video_frame.h"
 #include "media/renderers/mock_gpu_video_accelerator_factories.h"
 #include "media/video/gpu_memory_buffer_video_frame_pool.h"
@@ skipping 235 matching lines @@
   scoped_refptr<VideoFrame> frame;
   gpu_memory_buffer_pool_->MaybeCreateHardwareFrame(
       software_frame, base::Bind(MaybeCreateHardwareFrameCallback, &frame));
 
   RunUntilIdle();
 
   EXPECT_NE(software_frame.get(), frame.get());
   EXPECT_EQ(1u, gles2_->gen_textures);
 }
 
+// AllocateGpuMemoryBuffer can return null (e.g: when the GPU process is down).
+// This test checks that in that case we don't crash and still create the
+// textures.
+// If we try to create another VideoFrame after the GPU process became active
+// again we should discard the previous created resources and create new ones.
+TEST_F(GpuMemoryBufferVideoFramePoolTest, AllocateGMBFail) {

[reveman, 2015/09/10 00:09:12]

nit: s/AllocateGMBFail/FailToAllocateGpuMemoryBuffer/ to not abbreviate and have
the name be consistent SetFailToAllocateGpuMemoryBuffer.

[Daniele Castagna, 2015/09/10 00:15:35]

Done.

+  scoped_refptr<VideoFrame> software_frame = CreateTestYUVVideoFrame(10);
+  scoped_refptr<MockGpuVideoAcceleratorFactories> mock_gpu_factories(
+      new MockGpuVideoAcceleratorFactories);
+  mock_gpu_factories->SetFailToAllocateGpuMemoryBuffer(true);
+  scoped_ptr<GpuMemoryBufferVideoFramePool> gpu_memory_buffer_pool_ =
+      make_scoped_ptr(new GpuMemoryBufferVideoFramePool(
+          media_task_runner_, copy_task_runner_.get(), mock_gpu_factories));
+
+  EXPECT_CALL(*mock_gpu_factories.get(), GetGLES2Interface())
+      .WillRepeatedly(testing::Return(gles2_.get()));
+
+  scoped_refptr<VideoFrame> frame;
+  gpu_memory_buffer_pool_->MaybeCreateHardwareFrame(
+      software_frame, base::Bind(MaybeCreateHardwareFrameCallback, &frame));
+
+  RunUntilIdle();
+
+  EXPECT_NE(software_frame.get(), frame.get());
+  EXPECT_EQ(3u, gles2_->gen_textures);
+}
+
 }  // namespace media