gpu: Fix some context lost marking glitches+leaks and add UMA stats

gpu/command_buffer/service/gles2_cmd_decoder_mock.h

 // 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.
 
 // This file contains the mock GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_MOCK_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_MOCK_H_
 
 #include <vector>
@@ skipping 106 matching lines @@
   MOCK_METHOD1(SetShaderCacheCallback,
                void(const ShaderCacheCallback& callback));
   MOCK_METHOD1(SetWaitSyncPointCallback,
                void(const WaitSyncPointCallback& callback));
   MOCK_METHOD1(WaitForReadPixels,
                void(base::Closure callback));
   MOCK_METHOD0(GetTextureUploadCount, uint32());
   MOCK_METHOD0(GetTotalTextureUploadTime, base::TimeDelta());
   MOCK_METHOD0(GetTotalProcessingCommandsTime, base::TimeDelta());
   MOCK_METHOD1(AddProcessingCommandsTime, void(base::TimeDelta));
-  MOCK_METHOD0(WasContextLost, bool());
-  MOCK_METHOD0(WasContextLostByRobustnessExtension, bool());
-  MOCK_METHOD1(LoseContext, void(uint32 reset_status));
+  MOCK_CONST_METHOD0(WasContextLost, bool());
+  MOCK_CONST_METHOD0(WasContextLostByRobustnessExtension, bool());
+  MOCK_METHOD1(MarkContextLost, void(gpu::error::ContextLostReason reason));
 
   DISALLOW_COPY_AND_ASSIGN(MockGLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_MOCK_H_