Make touch-resizing windows to screen edge possible

ash/wm/window_resizer.h

Index: ash/wm/window_resizer.h
diff --git a/ash/wm/window_resizer.h b/ash/wm/window_resizer.h
index bc46df85e31a51b9adb9d2932678303db03eee87..51ac3b4798aaa07e8a3ca72c19f1d091f5c57e3e 100644
--- a/ash/wm/window_resizer.h
+++ b/ash/wm/window_resizer.h
@@ -89,6 +89,9 @@ class ASH_EXPORT WindowResizer {
 
     // 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,
@@ -97,6 +100,14 @@ class ASH_EXPORT WindowResizer {
   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: