Add //mojo/edk/platform and move platform_task_runners.h there.

shell/task_runners.h

 // Copyright 2013 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.
 
 #ifndef SHELL_TASK_RUNNERS_H_
 #define SHELL_TASK_RUNNERS_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
-#include "mojo/edk/embedder/platform_task_runner.h"
+#include "mojo/edk/platform/task_runner.h"
 #include "mojo/edk/util/ref_ptr.h"
 
 namespace base {
 class SequencedWorkerPool;
 }
 
 namespace shell {
 
 // A context object that contains the common task runners for the shell's main
 // process.
 class TaskRunners {
  public:
   explicit TaskRunners(
       const scoped_refptr<base::SingleThreadTaskRunner>& shell_runner);
   ~TaskRunners();
 
-  const mojo::util::RefPtr<mojo::embedder::PlatformTaskRunner>& shell_runner()
-      const {
+  const mojo::util::RefPtr<mojo::platform::TaskRunner>& shell_runner() const {
     return shell_runner_;
   }
 
-  const mojo::util::RefPtr<mojo::embedder::PlatformTaskRunner>& io_runner()
-      const {
+  const mojo::util::RefPtr<mojo::platform::TaskRunner>& io_runner() const {
     return io_runner_;
   }
 
   base::SequencedWorkerPool* blocking_pool() const {
     return blocking_pool_.get();
   }
 
  private:
-  mojo::util::RefPtr<mojo::embedder::PlatformTaskRunner> shell_runner_;
+  mojo::util::RefPtr<mojo::platform::TaskRunner> shell_runner_;
   scoped_ptr<base::Thread> io_thread_;
-  mojo::util::RefPtr<mojo::embedder::PlatformTaskRunner> io_runner_;
+  mojo::util::RefPtr<mojo::platform::TaskRunner> io_runner_;
 
   scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskRunners);
 };
 
 }  // namespace shell
 
 #endif  // SHELL_TASK_RUNNERS_H_