Enable native accessible touch support inside of ARC

ash/ash_touch_exploration_manager_chromeos.cc

Index: ash/ash_touch_exploration_manager_chromeos.cc
diff --git a/ash/ash_touch_exploration_manager_chromeos.cc b/ash/ash_touch_exploration_manager_chromeos.cc
index 1cd1ccd0f65ae20dcacd00110b5150331e9f6695..d4dd97d54fc3e9cdae1d559cc395b62e591fad69 100644
--- a/ash/ash_touch_exploration_manager_chromeos.cc
+++ b/ash/ash_touch_exploration_manager_chromeos.cc
@@ -135,7 +135,10 @@ void AshTouchExplorationManager::UpdateTouchExplorationState() {
   // See crbug.com/603745 for more details.
   const bool pass_through_surface =
       wm::GetActiveWindow() &&
-      wm::GetActiveWindow()->GetName() == kExoShellSurfaceWindowName;
+      wm::GetActiveWindow()->GetName() == kExoShellSurfaceWindowName &&
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(

[reveman, 2017/03/13 16:59:58]

I think you also need to check that the shell surface is actually an arc shell
surface before you consider this option. You'll need to get the application id
and check that it has a "org.chromium.arc." prefix.

[David Tseng, 2017/03/16 20:00:37]

I modified the check above (which indicates a pass through surface) to directly
check the new window property for arc app type.

+          chromeos::switches::kEnableChromeVoxArcSupport);
+  ;
 
   const bool spoken_feedback_enabled =
       WmShell::Get()->accessibility_delegate()->IsSpokenFeedbackEnabled();