Reland of Upgrade PixelStorei to ES3/WebGL2.

gpu/command_buffer/service/context_state.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 ContextState class.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
 
 #include <vector>
@@ skipping 248 matching lines @@
   scoped_refptr<Valuebuffer> bound_valuebuffer;
 
   bool pack_reverse_row_order;
   bool ignore_cached_state;
 
   mutable bool fbo_binding_for_scissor_workaround_dirty;
 
  private:
   void EnableDisable(GLenum pname, bool enable) const;
 
+  // If a buffer object is bound to PIXEL_PACK_BUFFER, set all pack parameters
+  // user values; otherwise, set them to 0.
+  void UpdatePackParameters() const;
+  // If a buffer object is bound to PIXEL_UNPACK_BUFFER, set all unpack
+  // parameters user values; otherwise, set them to 0.
+  void UpdateUnpackParameters() const;
+
   FeatureInfo* feature_info_;
   scoped_ptr<ErrorState> error_state_;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_