Using tap gesture instead of touch to activate windows in overview mode

This brings some improvements over the old touch event handling:
* Window is activated on the full tap gesture, which is
consistent with the mouse click event handling.
* The user can now cancel the gesture by sliding the finger
out of the window bounds without releasing it (not
activating any window).
* In the future it is going to be much easier to add support for other gestures,
  e.g. fling to dismiss.

Just handling the tap is not sufficient as the browser
window might consume touches, therefore preventing the
generation of tap gestures under our current architecture.
To circumvent this, I'm adding a transparent window on top
of the overview items, which covers the entire bounding box.

An added feature is that the transparent window covers the entire bounding box, even for panels, making them easier to click.

As a subproduct of this patch locking the cursor is no
longer necessary, so we fix a bug related to that, too.

Finally, by handling the OnWindowActivated instead of manually restoring the windows when they are clicked, we fix a bug caused by activating the window from the shelf.

BUG=336601,322688,368671,374283
TEST=WindowSelectorTest.BasicGesture,
WindowSelectorTest.WindowDoesNotReceiveEvents,
WindowSelectorTest.CloseButton

Review URL: https://codereview.chromium.org/269423008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273537 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 1 insertions, 1 deletions

diff --git a/ash/wm/maximize_mode/maximize_mode_window_manager.cc b/ash/wm/maximize_mode/maximize_mode_window_manager.cc
index 15278bf..788f3bf 100644
--- a/ash/wm/maximize_mode/maximize_mode_window_manager.cc
+++ b/ash/wm/maximize_mode/maximize_mode_window_manager.cc
@@ -31,7 +31,7 @@ void CancelOverview() {
   WindowSelectorController* controller =
       Shell::GetInstance()->window_selector_controller();
   if (controller && controller->IsSelecting())
-    controller->OnSelectionCanceled();
+    controller->OnSelectionEnded();
 }
 
 }  // namespace