Re-enable ChannelMojo.

ipc/mojo/ipc_channel_mojo.cc

 // Copyright 2014 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 "ipc/mojo/ipc_channel_mojo.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 216 matching lines @@
   } else {
     io_runner->PostTask(
         FROM_HERE, base::Bind(&mojo::embedder::DestroyChannelOnIOThread, ptr));
   }
 }
 
 //------------------------------------------------------------------------------
 
 // static
 bool ChannelMojo::ShouldBeUsed() {
-  // TODO(rockot): Investigate performance bottlenecks and hopefully reenable
-  // this at some point. http://crbug.com/500019
-  return false;
+  return true;
 }
 
 // static
 scoped_ptr<ChannelMojo> ChannelMojo::Create(
     scoped_refptr<base::TaskRunner> io_runner,
     const ChannelHandle& channel_handle,
     Mode mode,
     Listener* listener,
     AttachmentBroker* broker) {
   switch (mode) {
@@ skipping 301 matching lines @@
     if (!ok) {
       LOG(ERROR) << "Failed to add new Mojo handle.";
       return MOJO_RESULT_UNKNOWN;
     }
   }
 
   return MOJO_RESULT_OK;
 }
 
 }  // namespace IPC