Make touch-resizing windows to screen edge possible

ash/wm/window_resizer.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_WINDOW_RESIZER_H_
 #define ASH_WM_WINDOW_RESIZER_H_
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 71 matching lines @@
     int bounds_change;
 
     // Bitmask of the |kBoundsChangeDirection_| constants.
     int position_change_direction;
 
     // Bitmask of the |kBoundsChangeDirection_| constants.
     int size_change_direction;
 
     // Will the drag actually modify the window?
     bool is_resizable;
+
+    // Is the drag initiated by a touch action?
+    bool is_touch;
   };
 
   static gfx::Rect CalculateBoundsForDrag(const Details& details,
                                           const gfx::Point& location);
 
   static gfx::Rect AdjustBoundsToGrid(const gfx::Rect& bounds,
                                       int grid_size);
 
+  // Adjusts amounts of movement for touch resizes. Normally, the window border
+  // being dragged is several pixels behind the finger. This adjustment gives
+  // more speed to the window border, such that the border and the finger line
+  // up at the edge of the screen.
+  static void AdjustDeltaForTouch(const Details& details,
+                                  int* delta_x,
+                                  int* delta_y);
+
   static bool IsBottomEdge(int component);
 
  private:
   // Returns the new origin of the window. The arguments are the difference
   // between the current location and the initial location.
   static gfx::Point GetOriginForDrag(const Details& details,
                                      int delta_x,
                                      int delta_y);
 
   // Returns the size of the window for the drag.
@@ skipping 15 matching lines @@
 // Creates a WindowResizer for |window|. This can return a scoped_ptr
 // initialized with NULL if |window| should not be resized nor dragged.
 ASH_EXPORT scoped_ptr<WindowResizer> CreateWindowResizer(
     aura::Window* window,
     const gfx::Point& point_in_parent,
     int window_component);
 
 }  // namespace aura
 
 #endif  // ASH_WM_WINDOW_RESIZER_H_