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

gpu/command_buffer/service/gles2_cmd_decoder_mock.h

Index: gpu/command_buffer/service/gles2_cmd_decoder_mock.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
index c58405bb2e792223fc0e51f4634e1e798cef9f3d..65df53c53dfdc02646ed27a10df1066c6792b281 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_mock.h
@@ -124,9 +124,9 @@ class MockGLES2Decoder : public GLES2Decoder {
   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);
 };