Make mash register initial batch of accelerators in single shot.

ui/base/accelerators/accelerator_manager_delegate.h

Index: ui/base/accelerators/accelerator_manager_delegate.h
diff --git a/ui/base/accelerators/accelerator_manager_delegate.h b/ui/base/accelerators/accelerator_manager_delegate.h
index e3c6d9ccf6e53ebee773c721a1374ae0b03e18c0..b780dcf6604eeed4f56b6a9bc6e2c70ae0796f4c 100644
--- a/ui/base/accelerators/accelerator_manager_delegate.h
+++ b/ui/base/accelerators/accelerator_manager_delegate.h
@@ -13,11 +13,12 @@ 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 a number of accelerators are registered at once. An accelerator

[sky, 2017/01/28 00:09:15]

How about:
Called when new accelerators are registered. This is only called with
newly registered accelerators. For example, if Register() is
called with A and B, then OnAcceleratorsRegistered() is called with A and B. If
Register() is subsequently called with A and C, then OnAcceleratorsRegistered()
is only called with C, as A was already registered.

[thanhph1, 2017/01/30 16:37:54]

Done, thanks! This is clear.

+  // is only included in the |accelerators| vector when the first time a target
+  // for the accelerator is registered. 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;
 
   // Called when there no more targets are registered for |accelerator|.
   virtual void OnAcceleratorUnregistered(const Accelerator& accelerator) = 0;