Ignore custom offscreen surface unless explicitly opted in

gpu/command_buffer/common/gles2_cmd_utils.cc

 // 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 is here so other GLES2 related files can have a common set of
 // includes where appropriate.
 
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 
 #include <GLES2/gl2.h>
@@ skipping 1905 matching lines @@
       red_size(-1),
       depth_size(-1),
       stencil_size(-1),
       samples(-1),
       sample_buffers(-1),
       buffer_preserved(true),
       bind_generates_resource(true),
       fail_if_major_perf_caveat(false),
       lose_context_when_out_of_memory(false),
       should_use_native_gmb_for_backbuffer(false),
+      own_offscreen_surface(false),
       context_type(CONTEXT_TYPE_OPENGLES2) {}
 
 ContextCreationAttribHelper::ContextCreationAttribHelper(
     const ContextCreationAttribHelper& other) = default;
 
 bool ContextCreationAttribHelper::Parse(const std::vector<int32_t>& attribs) {
   for (size_t i = 0; i < attribs.size(); i += 2) {
     const int32_t attrib = attribs[i];
     if (i + 1 >= attribs.size()) {
       if (attrib == kNone) {
@@ skipping 58 matching lines @@
     }
   }
 
   return true;
 }
 
 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu