ash: Holding down shift slows window animations for debugging

* Adds SlowAnimationEventFilter to look for raw shift-press events
* Adds tests for above
* Adds "slow animation mode" to layer animator that slows down layer animations by a factor of 4 for visual testing/debugging
* Fixes some typos in comments

I elected to make this a new event filter because I can't accomplish this with a regular accelerator and I didn't want to pollute any of the existing filters with this functionality.

BUG=130168
TEST=aura_shell_unittests SlowAnimationEventFilterTest, hold down shift and maximize/restore windows


Review URL: https://chromiumcodereview.appspot.com/10456034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139986 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 0 deletions

diff --git a/ash/shell.h b/ash/shell.h
index 153cd44..0e64b71 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -88,6 +88,7 @@ class ScreenDimmer;
 class ShadowController;
 class ShelfLayoutManager;
 class ShellContextMenu;
+class SlowAnimationEventFilter;
 class SystemGestureEventFilter;
 class StackingController;
 class StatusAreaWidget;
@@ -408,6 +409,10 @@ class ASH_EXPORT Shell {
   // a heads-up display. This is enabled only if --ash-touch-hud flag is used.
   scoped_ptr<internal::TouchObserverHUD> touch_observer_hud_;
 
+  // An event filter that looks for modifier keypresses and triggers a slowdown
+  // of layer animations for visual debugging.
+  scoped_ptr<internal::SlowAnimationEventFilter> slow_animation_filter_;
+
   // The shelf for managing the launcher and the status widget in non-compact
   // mode. Shell does not own the shelf. Instead, it is owned by container of
   // the status area.