Make touch accessibility gestures work with ChromeVox Next

ash/accessibility_delegate.h

Index: ash/accessibility_delegate.h
diff --git a/ash/accessibility_delegate.h b/ash/accessibility_delegate.h
index b677cf9ecf424737a3bb3786de9b24ba6271f8be..6cafedd9ac1f56edb3edc13e5a21168f877fd845 100644
--- a/ash/accessibility_delegate.h
+++ b/ash/accessibility_delegate.h
@@ -7,6 +7,7 @@
 
 #include "ash/ash_export.h"
 #include "base/time/time.h"
+#include "ui/accessibility/ax_enums.h"
 #include "ui/chromeos/accessibility_types.h"
 
 namespace ash {
@@ -124,6 +125,10 @@ class ASH_EXPORT AccessibilityDelegate {
 
   // Initiates play of shutdown sound and returns it's duration.
   virtual base::TimeDelta PlayShutdownSound() const = 0;
+
+  // Forward an accessibility gesture from the touch exploration controller to
+  // ChromeVox.
+  virtual void HandleAccessibilityGesture(ui::AXGesture gesture) = 0;
 };
 
 }  // namespace ash