Move flush id from WebGraphicsContext3DImpl to GLES2Implementation.

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 774 matching lines @@
 
   // When true, the context is lost when a GL_OUT_OF_MEMORY error occurs.
   const bool lose_context_when_out_of_memory_;
 
   // Whether or not to support client side arrays.
   const bool support_client_side_arrays_;
 
   // Used to check for single threaded access.
   int use_count_;
 
+  // Changed every time a flush or finish occurs.
+  uint32_t flush_id_;
+
   // Maximum amount of extra memory from the mapped memory pool to use when
   // needing to transfer something exceeding the default transfer buffer.
   // This should be 0 for low memory devices since they are already memory
   // constrained.
   const uint32_t max_extra_transfer_buffer_size_;
 
   // Set of strings returned from glGetString.  We need to cache these because
   // the pointer passed back to the client has to remain valid for eternity.
   std::set<std::string> gl_strings_;
 
@@ skipping 79 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_