Revert of Pass initial size and GPU preference via context attributes

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 <stdint.h>
@@ skipping 136 matching lines @@
   //  context: the GL context to render to.
   //  offscreen: whether to make the context offscreen or not. When FBO 0 is
   //      bound, offscreen contexts render to an internal buffer, onscreen ones
   //      to the surface.
   //  offscreen_size: the size if the GL context is offscreen.
   // Returns:
   //   true if successful.
   virtual bool Initialize(const scoped_refptr<gl::GLSurface>& surface,
                           const scoped_refptr<gl::GLContext>& context,
                           bool offscreen,
+                          const gfx::Size& offscreen_size,
                           const DisallowedFeatures& disallowed_features,
                           const ContextCreationAttribHelper& attrib_helper) = 0;
 
   // Destroys the graphics context.
   virtual void Destroy(bool have_context) = 0;
 
   // Set the surface associated with the default FBO.
   virtual void SetSurface(const scoped_refptr<gl::GLSurface>& surface) = 0;
   // Releases the surface associated with the GL context.
   // The decoder should not be used until a new surface is set.
@@ skipping 177 matching lines @@
   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_