Pass initial size and GPU preference via context attributes

gpu/command_buffer/service/gles2_cmd_decoder_passthrough.cc

 // Copyright (c) 2016 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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder_passthrough.h"
 
 namespace gpu {
 namespace gles2 {
 
 GLES2DecoderPassthroughImpl::GLES2DecoderPassthroughImpl(ContextGroup* group)
@@ skipping 75 matching lines @@
   if (command_id >= kFirstGLES2Command && command_id < kNumCommands) {
     return gles2::GetCommandName(static_cast<CommandId>(command_id));
   }
   return GetCommonCommandName(static_cast<cmd::CommandId>(command_id));
 }
 
 bool GLES2DecoderPassthroughImpl::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) {
   // Take ownership of the context and surface. The surface can be replaced
   // with SetSurface.
   context_ = context;
   surface_ = surface;
 
   if (!group_->Initialize(this, attrib_helper.context_type,
                           disallowed_features)) {
     group_ = NULL;  // Must not destroy ContextGroup if it is not initialized.
@@ skipping 267 matching lines @@
   }, /* NOLINT */
 
 const GLES2DecoderPassthroughImpl::CommandInfo
     GLES2DecoderPassthroughImpl::command_info[] = {
         GLES2_COMMAND_LIST(GLES2_CMD_OP)};
 
 #undef GLES2_CMD_OP
 
 }  // namespace gles2
 }  // namespace gpu