remove 'unsafe' from ES3 apis in gpu process

gpu/command_buffer/service/context_group.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.
 
 #include "gpu/command_buffer/service/context_group.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 100 matching lines @@
     DCHECK(feature_info_);
     if (!mailbox_manager_.get())
       mailbox_manager_ = new MailboxManagerImpl;
     transfer_buffer_manager_ = new TransferBufferManager(memory_tracker_.get());
   }
 }
 
 bool ContextGroup::Initialize(GLES2Decoder* decoder,
                               ContextType context_type,
                               const DisallowedFeatures& disallowed_features) {
+  if (!gpu_preferences_.enable_unsafe_es3_apis) {
+    if (context_type == CONTEXT_TYPE_OPENGLES3) {
+      context_type = CONTEXT_TYPE_OPENGLES2;

[Zhenyao Mo, 2016/11/02 22:49:57]

You should print out a DLOG as the WEBGL2 case. No need to change context_type.

+      return false;
+    } else if (context_type == CONTEXT_TYPE_WEBGL2) {
+      DLOG(ERROR) << "ContextGroup::Initialize failed because WebGL 2 is not "
+                  << "available.";
+      return false;
+    }
+  }
   if (HaveContexts()) {
     if (context_type != feature_info_->context_type()) {
       DLOG(ERROR) << "ContextGroup::Initialize failed because the type of "
                   << "the context does not fit with the group.";
       return false;
     }
     // If we've already initialized the group just add the context.
     decoders_.push_back(base::AsWeakPtr<GLES2Decoder>(decoder));
     return true;
   }
@@ skipping 486 matching lines @@
     GLuint client_id, GLuint* service_id) const {
   Buffer* buffer = buffer_manager_->GetBuffer(client_id);
   if (!buffer)
     return false;
   *service_id = buffer->service_id();
   return true;
 }
 
 }  // namespace gles2
 }  // namespace gpu