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

gpu/command_buffer/service/gles2_cmd_decoder.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 GLES2Decoder class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_
 
 #include <vector>
@@ skipping 223 matching lines @@
       const WaitSyncPointCallback& callback) = 0;
 
   virtual void WaitForReadPixels(base::Closure callback) = 0;
   virtual uint32 GetTextureUploadCount() = 0;
   virtual base::TimeDelta GetTotalTextureUploadTime() = 0;
   virtual base::TimeDelta GetTotalProcessingCommandsTime() = 0;
   virtual void AddProcessingCommandsTime(base::TimeDelta) = 0;
 
   // Returns true if the context was lost either by GL_ARB_robustness, forced
   // context loss or command buffer parse error.
-  virtual bool WasContextLost() = 0;
+  virtual bool WasContextLost() const = 0;
 
   // Returns true if the context was lost specifically by GL_ARB_robustness.
-  virtual bool WasContextLostByRobustnessExtension() = 0;
+  virtual bool WasContextLostByRobustnessExtension() const = 0;
 
   // Lose this context.
-  virtual void LoseContext(uint32 reset_status) = 0;
+  virtual void MarkContextLost(error::ContextLostReason reason) = 0;
 
   virtual Logger* GetLogger() = 0;
 
   virtual void BeginDecoding();
   virtual void EndDecoding();
 
   virtual const ContextState* GetContextState() = 0;
 
  protected:
   GLES2Decoder();
 
  private:
   bool initialized_;
   bool debug_;
   bool log_commands_;
   bool unsafe_es3_apis_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(GLES2Decoder);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_DECODER_H_