Make mash register initial batch of accelerators in single shot.

ash/mus/accelerators/accelerator_controller_registrar.h

Index: ash/mus/accelerators/accelerator_controller_registrar.h
diff --git a/ash/mus/accelerators/accelerator_controller_registrar.h b/ash/mus/accelerators/accelerator_controller_registrar.h
index da2841f6979bc5b64bcfcb49f710e495ba346a34..9e57edc90c2d05610d4ee52668be876336854d55 100644
--- a/ash/mus/accelerators/accelerator_controller_registrar.h
+++ b/ash/mus/accelerators/accelerator_controller_registrar.h
@@ -8,6 +8,7 @@
 #include <stdint.h>
 
 #include <map>
+#include <vector>
 
 #include "ash/mus/accelerators/accelerator_handler.h"
 #include "base/macros.h"
@@ -42,7 +43,15 @@ class AcceleratorControllerRegistrar : public AcceleratorHandler,
   void OnAcceleratorRegistered(const ui::Accelerator& accelerator) override;
   void OnAcceleratorUnregistered(const ui::Accelerator& accelerator) override;
 
+  void OnAcceleratorsRegistered(
+      const std::vector<ui::Accelerator>& accelerators) override;
+
  private:
+  // Add accelerator with newly generated id to accelerator vector.

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

IMHO "newly generated id" is a bit ambiguous, because it is not clear what
generates them - it's better to just say "generates the id". Also, this function
adds two accelerators to the vector (pre and post) - a detail which is worth
mentioning.
Something like this would do:
Creates a PRE_TARGET and POST_TARGET mojom accelerators for the provided
|accelerator| and adds them to the provided |accelerator_vector|.

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

Done, thanks! Please review my new comment.

+  void AddAcceleratorToVector(
+      const ui::Accelerator& accelerator,
+      std::vector<ui::mojom::AcceleratorPtr>& accelerator_vector);
+
   friend class AcceleratorControllerRegistrarTestApi;
 
   // The flow of accelerators in ash is:
@@ -86,6 +95,8 @@ class AcceleratorControllerRegistrar : public AcceleratorHandler,
 
   std::unique_ptr<AcceleratorRouter> router_;
 
+  std::vector<ui::mojom::AcceleratorPtr> accelerator_ptrs_;
+
   // Set of registered local ids.
   std::set<uint16_t> ids_;