Make accelerators not to work when the keyboard overlay is shown.

ash/wm/partial_screenshot_view.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_WM_PARTIAL_SCREENSHOT_VIEW_H_
 #define ASH_WM_PARTIAL_SCREENSHOT_VIEW_H_
 
 #include "ash/ash_export.h"
+#include "ash/wm/overlay_event_filter.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/point.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace ash {
 class ScreenshotDelegate;
 
 // The view of taking partial screenshot, i.e.: drawing region
 // rectangles during drag, and changing the mouse cursor to indicate
 // the current mode.
-class ASH_EXPORT PartialScreenshotView : public views::WidgetDelegateView {
+class ASH_EXPORT PartialScreenshotView
+    : public views::WidgetDelegateView,
+      public internal::OverlayEventFilter::Delegate {
  public:
   PartialScreenshotView(ScreenshotDelegate* screenshot_delegate);
   virtual ~PartialScreenshotView();
 
   // Starts the UI for taking partial screenshot; dragging to select a region.
   static void StartPartialScreenshot(ScreenshotDelegate* screenshot_delegate);
 
-  // Cancels the current screenshot UI.
-  void Cancel();
-
   // Overriddden from View:
   virtual gfx::NativeCursor GetCursor(const views::MouseEvent& event) OVERRIDE;
 
+  // Overridden from internal::OverlayEventFilter::Delegate:
+  virtual void Cancel() OVERRIDE;
+  virtual bool IsCancelingKeyEvent(aura::KeyEvent* event) OVERRIDE;
+  virtual aura::Window* GetWindow() OVERRIDE;
+
  private:
   gfx::Rect GetScreenshotRect() const;
 
   // Overridden from View:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const views::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseWheel(const views::MouseWheelEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const views::MouseEvent& event) OVERRIDE;
 
   bool is_dragging_;
   gfx::Point start_position_;
   gfx::Point current_position_;
   ScreenshotDelegate* screenshot_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(PartialScreenshotView);
 };
 
 }  // namespace ash
 
 #endif  // #ifndef ASH_WM_PARTIAL_SCREENSHOT_VIEW_H_