[ash-md] Adds support for gesture to move selection in overview mode

ash/common/wm/overview/window_selector.h

Index: ash/common/wm/overview/window_selector.h
diff --git a/ash/common/wm/overview/window_selector.h b/ash/common/wm/overview/window_selector.h
index bb3f6d417088ef7326f40418600a82bf1041a31e..550c280e36cab42771b0d721db25a518a4972317 100644
--- a/ash/common/wm/overview/window_selector.h
+++ b/ash/common/wm/overview/window_selector.h
@@ -61,6 +61,14 @@ class ASH_EXPORT WindowSelector : public display::DisplayObserver,
   // Called when the last window selector item from a grid is deleted.
   void OnGridEmpty(WindowGrid* grid);
 
+  // Moves the current selection by |increment| items. Positive values of
+  // |increment| move the selection forward, negative values mov it backward.

[tdanderson, 2017/02/06 20:13:57]

nit: "move"

[varkha, 2017/02/08 20:41:13]

Done.

+  void IncrementSelection(int increment);
+
+  // Accepts current selection if any. Returns true if a selection was made,
+  // false otherwise.
+  bool AcceptSelection();
+
   // Activates |item's| window.
   void SelectWindow(WindowSelectorItem* item);