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

ash/common/wm/overview/window_grid.cc

Index: ash/common/wm/overview/window_grid.cc
diff --git a/ash/common/wm/overview/window_grid.cc b/ash/common/wm/overview/window_grid.cc
index 7cea80ba59af38a8f7f1a6fa0ed0e880a005b46d..e68ef074a019c3a0c8857f5480af9aa717361af6 100644
--- a/ash/common/wm/overview/window_grid.cc
+++ b/ash/common/wm/overview/window_grid.cc
@@ -282,7 +282,8 @@ WindowGrid::WindowGrid(WmWindow* root_window,
       window_state_observer_(this),
       selected_index_(0),
       num_columns_(0),
-      prepared_for_overview_(false) {
+      prepared_for_overview_(false),
+      skip_first_(false) {
   std::vector<WmWindow*> windows_in_root;
   for (auto* window : windows) {
     if (window->GetRootWindow() == root_window)
@@ -488,9 +489,10 @@ bool WindowGrid::Move(WindowSelector::Direction direction, bool animate) {
         break;
       case WindowSelector::DOWN:
       case WindowSelector::RIGHT:
-        selected_index_ = 0;
+        selected_index_ = (skip_first_ && window_list_.size() > 1) ? 1 : 0;
         break;
     }
+    skip_first_ = false;
     changed_selection_index = true;
   }
   while (!changed_selection_index ||