Add a workaround for crbug.com/139556.

ash/accelerators/accelerator_controller.h

 // Copyright (c) 2012 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 ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
 #define ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_
 
 #include <map>
 #include <set>
 
@@ skipping 21 matching lines @@
 // or if the current accelerator is repeated or not.
 class ASH_EXPORT AcceleratorControllerContext {
  public:
   AcceleratorControllerContext();
   ~AcceleratorControllerContext() {}
 
   // Updates context - determines if the accelerator is repeated, as well as
   // event type of the previous accelerator.
   void UpdateContext(const ui::Accelerator& accelerator);
 
-  ui::EventType previous_event_type() const { return previous_event_type_; }
-  bool repeated() const { return repeated_; }
+  const ui::Accelerator& previous_accelerator() const {
+    return previous_accelerator_;
+  }
+  bool repeated() const {
+    return current_accelerator_ == previous_accelerator_ &&
+        current_accelerator_.type() != ui::ET_UNKNOWN;
+  }
 
  private:
   ui::Accelerator current_accelerator_;
-
-  // If the current accelerator was repeated.
-  bool repeated_;
-
-  // Event type of the previous accelerator. Used for NEXT_IME and
-  // DISABLE_CAPS_LOCK accelerator actions.
-  ui::EventType previous_event_type_;
+  // Used for NEXT_IME and DISABLE_CAPS_LOCK accelerator actions.
+  ui::Accelerator previous_accelerator_;
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratorControllerContext);
 };
 
 // AcceleratorController provides functions for registering or unregistering
 // global keyboard accelerators, which are handled earlier than any windows. It
 // also implements several handlers as an accelerator target.
 class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
  public:
   AcceleratorController();
@@ skipping 96 matching lines @@
   std::set<int> reserved_actions_;
   // Actions which will not be repeated while holding the accelerator key.
   std::set<int> nonrepeatable_actions_;
 
   DISALLOW_COPY_AND_ASSIGN(AcceleratorController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_ACCELERATOR_CONTROLLER_H_