Hook up the ANGLE extensions for disabling client-side data.

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"
 
 #include "base/strings/string_split.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "ui/gl/gl_version_info.h"
@@ skipping 158 matching lines @@
                           disallowed_features)) {
     group_ = NULL;  // Must not destroy ContextGroup if it is not initialized.
     Destroy(true);
     return false;
   }
 
   // Check for required extensions
   if (!feature_info_->feature_flags().angle_robust_client_memory ||
       !feature_info_->feature_flags().chromium_bind_generates_resource ||
       !feature_info_->feature_flags().chromium_copy_texture ||
-      !feature_info_->feature_flags().chromium_copy_compressed_texture) {
+      !feature_info_->feature_flags().chromium_copy_compressed_texture ||
+      !feature_info_->feature_flags().angle_client_arrays ||
+      glIsEnabled(GL_CLIENT_ARRAYS_ANGLE) != GL_FALSE) {

[Zhenyao Mo, 2017/02/16 21:59:45]

So context creation should only continue if ANGLE_client_arrays exists but not
enabled?

[Geoff Lang, 2017/02/16 22:08:26]

It continues only if the extension exists and the client arrays feature has been
disabled.

     // TODO(geofflang): Verify that ANGLE_webgl_compatibility is enabled if this
     // is a WebGL context (depends on crbug.com/671217).
     Destroy(true);
     return false;
   }
 
   image_manager_.reset(new ImageManager());
 
   bind_generates_resource_ = group_->bind_generates_resource();
 
@@ skipping 668 matching lines @@
   }, /* NOLINT */
 
 const GLES2DecoderPassthroughImpl::CommandInfo
     GLES2DecoderPassthroughImpl::command_info[] = {
         GLES2_COMMAND_LIST(GLES2_CMD_OP)};
 
 #undef GLES2_CMD_OP
 
 }  // namespace gles2
 }  // namespace gpu