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..e70329bb9162ce3c71cc866b26d0cd23456212a1 100644
--- a/ui/base/accelerators/accelerator_manager_delegate.h
+++ b/ui/base/accelerators/accelerator_manager_delegate.h
@@ -22,6 +22,13 @@ class UI_BASE_EXPORT AcceleratorManagerDelegate {
   // 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() {}
 };