Refactor gpu::Buffer to allow different types of backing

gpu/command_buffer/service/query_manager_unittest.cc

 // Copyright (c) 2012 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 "gpu/command_buffer/service/query_manager.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/service/cmd_buffer_engine.h"
 #include "gpu/command_buffer/service/error_state_mock.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_mock.h"
@@ skipping 75 matching lines @@
   scoped_ptr< ::testing::StrictMock< ::gfx::MockGLInterface> > gl_;
   scoped_ptr<MockGLES2Decoder> decoder_;
   scoped_ptr<QueryManager> manager_;
 
  private:
   class MockCommandBufferEngine : public CommandBufferEngine {
    public:
     MockCommandBufferEngine() {
       scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
       shared_memory->CreateAndMapAnonymous(kSharedBufferSize);
-      valid_buffer_ = new gpu::Buffer(shared_memory.Pass(), kSharedBufferSize);
+      valid_buffer_ =
+          MakeBufferFromSharedMemory(shared_memory.Pass(), kSharedBufferSize);
       data_ = static_cast<uint8*>(valid_buffer_->memory());
       ClearSharedMemory();
     }
 
     virtual ~MockCommandBufferEngine() {
     }
 
     virtual scoped_refptr<gpu::Buffer> GetSharedMemoryBuffer(int32 shm_id)
         OVERRIDE {
       return shm_id == kSharedMemoryId ? valid_buffer_ : invalid_buffer_;
@@ skipping 461 matching lines @@
 
   EXPECT_EQ(static_cast<GLuint>(GL_INVALID_ENUM), sync->result);
 
   manager->Destroy(false);
 }
 
 }  // namespace gles2
 }  // namespace gpu