Use active state on touch start for tray icons

ash/system/overview/overview_button_tray.cc

Index: ash/system/overview/overview_button_tray.cc
diff --git a/ash/system/overview/overview_button_tray.cc b/ash/system/overview/overview_button_tray.cc
index b56efa9404014e9974e2f2c07fedf520bb73a421..2ee7051b0c8e01925271a09a37fff7bdd80b6aed 100644
--- a/ash/system/overview/overview_button_tray.cc
+++ b/ash/system/overview/overview_button_tray.cc
@@ -54,7 +54,10 @@ void OverviewButtonTray::UpdateAfterLoginStatusChange(
 }
 
 bool OverviewButtonTray::PerformAction(const ui::Event& event) {
-  Shell::GetInstance()->window_selector_controller()->ToggleOverview();
+  WindowSelectorController* controller =
+      Shell::GetInstance()->window_selector_controller();
+  controller->ToggleOverview();
+  SetDrawBackgroundAsActive(controller->IsSelecting());

[Mr4D (OOO till 08-26), 2014/09/04 19:58:35]

Shouldn't this command also be dependent on the commandline option?

[jonross, 2014/09/05 16:31:49]

This I added because currently the overview button does not paint an active
state while overview mode is on. Meanwhile the other trays do paint as active,
regardless of the touch feedback experiment.

However I could make this dependent on the command line.

[Mr4D (OOO till 08-26), 2014/09/05 16:38:57]

I think that should be fine.

   return true;
 }