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 e77cd13a6fbb0523f0d92f3b8d368c38e77486f6..c0572731aaff5538454c44cf8aa3c07987323f4f 100644
--- a/ash/ash_touch_exploration_manager_chromeos.cc
+++ b/ash/ash_touch_exploration_manager_chromeos.cc
@@ -9,6 +9,7 @@
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "ash/root_window_controller.h"
+#include "ash/shared/app_types.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
 #include "base/command_line.h"
@@ -16,6 +17,7 @@
 #include "chromeos/audio/chromeos_sounds.h"
 #include "chromeos/audio/cras_audio_handler.h"
 #include "chromeos/chromeos_switches.h"
+#include "ui/aura/client/aura_constants.h"
 #include "ui/chromeos/touch_exploration_controller.h"
 #include "ui/wm/public/activation_client.h"
 
@@ -132,13 +134,13 @@ void AshTouchExplorationManager::SetTouchAccessibilityAnchorPoint(
 }
 
 void AshTouchExplorationManager::UpdateTouchExplorationState() {
-  // Comes from components/exo/shell_surface.cc.
-  const char kExoShellSurfaceWindowName[] = "ExoShellSurface";
-
   // See crbug.com/603745 for more details.
   const bool pass_through_surface =
       wm::GetActiveWindow() &&
-      wm::GetActiveWindow()->GetName() == kExoShellSurfaceWindowName;
+      wm::GetActiveWindow()->GetProperty(aura::client::kAppType) ==
+          static_cast<int>(ash::AppType::ARC_APP) &&
+      !base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kEnableChromeVoxArcSupport);

[reveman, 2017/03/16 22:42:19]

nit: maybe check this command line switch in the ctor instead of everytime this
function is called?

[David Tseng, 2017/03/20 16:38:03]

Shouldn't be an issue (this function gets called on construction, mode changes,
and window activation). Window activation should be most frequent, but shouldn't
be that frequent. I added it as a member field initialized in  the ctor though
just incase.

 
   const bool spoken_feedback_enabled =
       Shell::GetInstance()->accessibility_delegate()->IsSpokenFeedbackEnabled();