(not for commit) Simplified multi-threaded Ganesh with lock on Flush only.

gpu/command_buffer/client/gles2_implementation.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.
 
 #ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 #define GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_
 
 #include <GLES2/gl2.h>
 
 #include <list>
@@ skipping 176 matching lines @@
   GLES2CmdHelper* helper() const;
 
   // Gets client side generated errors.
   GLenum GetClientSideGLError();
 
   // Include the auto-generated part of this class. We split this because
   // it means we can easily edit the non-auto generated parts right here in
   // this file instead of having to edit some template or the code generator.
   #include "gpu/command_buffer/client/gles2_implementation_autogen.h"
 
+  void SetSafeFlushPoint() override;
+  void SafeFlush() override;
+
   void DisableVertexAttribArray(GLuint index) override;
   void EnableVertexAttribArray(GLuint index) override;
   void GetVertexAttribfv(GLuint index, GLenum pname, GLfloat* params) override;
   void GetVertexAttribiv(GLuint index, GLenum pname, GLint* params) override;
 
   // ContextSupport implementation.
   void Swap() override;
   void PartialSwapBuffers(const gfx::Rect& sub_buffer) override;
   void ScheduleOverlayPlane(int plane_z_order,
                             gfx::OverlayTransform plane_transform,
@@ skipping 588 matching lines @@
 
 inline bool GLES2Implementation::GetTexParameterivHelper(
     GLenum /* target */, GLenum /* pname */, GLint* /* params */) {
   return false;
 }
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_IMPLEMENTATION_H_