Makes escape cancel a snap operation from the maximize button.

ash/wm/workspace/frame_maximize_button.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_WORKSPACE_FRAME_MAXIMIZE_BUTTON_H_
 #define ASH_WM_WORKSPACE_FRAME_MAXIMIZE_BUTTON_H_
 
 #include "ash/ash_export.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/controls/button/image_button.h"
@@ skipping 16 matching lines @@
   virtual void OnMouseExited(const views::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
 
  protected:
   // ImageButton overrides:
   virtual SkBitmap GetImageToPaint() OVERRIDE;
 
  private:
+  class EscapeEventFilter;
+
   // Where to snap to.
   enum SnapType {
     SNAP_LEFT,
     SNAP_RIGHT,
     SNAP_MAXIMIZE,
     SNAP_MINIMIZE,
     SNAP_NONE
   };
 
+  // Cancels snap behavior.
+  void Cancel();
+
+  // Installs/uninstalls an EventFilter to track when escape is pressed.
+  void InstallEventFilter();
+  void UninstallEventFilter();
+
   // Updates |snap_type_| based on a mouse drag. The parameters are relative to
   // the mouse pressed location.
   void UpdateSnap(int delta_x, int delta_y);
 
   // Returns the type of snap based on the specified coordaintes (relative to
   // the press location).
   SnapType SnapTypeForDelta(int delta_x, int delta_y) const;
 
   // Returns the bounds of the resulting window for the specified type.
   gfx::Rect BoundsForType(SnapType type) const;
@@ skipping 10 matching lines @@
 
   // Did the user drag far enough to trigger snapping?
   bool exceeded_drag_threshold_;
 
   // Location of the press.
   gfx::Point press_location_;
 
   // Current snap type.
   SnapType snap_type_;
 
+  scoped_ptr<EscapeEventFilter> escape_event_filter_;
+
   DISALLOW_COPY_AND_ASSIGN(FrameMaximizeButton);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_FRAME_MAXIMIZE_BUTTON_H_