Fire accessibilityPrivate events on two-finger hold gesture.

chrome/browser/chromeos/accessibility/accessibility_manager.h

Index: chrome/browser/chromeos/accessibility/accessibility_manager.h
diff --git a/chrome/browser/chromeos/accessibility/accessibility_manager.h b/chrome/browser/chromeos/accessibility/accessibility_manager.h
index dd9fe7639ba73894c4fb2d2441f98811ffeb04c8..ff2e326c3ad2000f1180f9f8250f1d026b978ae5 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_manager.h
+++ b/chrome/browser/chromeos/accessibility/accessibility_manager.h
@@ -260,6 +260,14 @@ class AccessibilityManager
   // Notify accessibility when locale changes occur.
   void OnLocaleChanged();
 
+  // Called when we first detect two fingers are held down, which can be
+  // used to toggle spoken feedback on some touch-only devices.
+  void OnTwoFingerTouchStart();
+
+  // Called when the user is no longer holding down two fingers (including
+  // releasing one, holding down three, or moving them).
+  void OnTwoFingerTouchStop();
+
   // Whether or not to enable toggling spoken feedback via holding down
   // two fingers on the screen.
   bool ShouldToggleSpokenFeedbackViaTouch();