Make mash register initial batch of accelerators in single shot.

ui/base/accelerators/accelerator_manager_delegate.h

 // Copyright 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.
 
 #ifndef UI_BASE_ACCELERATORS_ACCELERATOR_MANAGER_DELEGATE_H_
 #define UI_BASE_ACCELERATORS_ACCELERATOR_MANAGER_DELEGATE_H_
 
 #include "ui/base/ui_base_export.h"
 
 namespace ui {
 
 class Accelerator;
 
 class UI_BASE_EXPORT AcceleratorManagerDelegate {
  public:
   // Called the first time a target is registered for |accelerator|. This is
   // only called the first time a target is registered for a unique accelerator.
   // For example, if Register() is called twice with the same accelerator
   // this is called only for the first call.
   virtual void OnAcceleratorRegistered(const Accelerator& accelerator) = 0;
 
   // Called when there no more targets are registered for |accelerator|.
   virtual void OnAcceleratorUnregistered(const Accelerator& accelerator) = 0;
 
+  // Called the first time a target is registered for each accelerator in

[mfomitchev, 2017/01/03 19:54:35]

I think this would be a bit more clear:

Called when a number of accelerators are registered at once. An accelerator is
only included in the |accelerators| vector the first time a target for it is
registered.

[thanhph1, 2017/01/06 21:55:56]

I modified it a bit. Let me know if it's clear. Thanks!

+  // |accelerators|. This is only called the first time a target is registered
+  // for each unique accelerator. For example, if Register() is called twice
+  // with the same accelerator, this is called only for the first call.
+  virtual void OnAcceleratorsRegistered(
+      const std::vector<ui::Accelerator>& accelerators) = 0;
+
  protected:
   virtual ~AcceleratorManagerDelegate() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_ACCELERATORS_ACCELERATOR_MANAGER_DELEGATE_H_