Reset accessibility if it gets out of sync.

content/renderer/accessibility/renderer_accessibility_complete.h

Index: content/renderer/accessibility/renderer_accessibility_complete.h
diff --git a/content/renderer/accessibility/renderer_accessibility_complete.h b/content/renderer/accessibility/renderer_accessibility_complete.h
index 63c0d7e690b89ccb072cdc7b2bd35e828b4e8516..92091fb91b95396da7f1a73f641bf5d346c3cb24 100644
--- a/content/renderer/accessibility/renderer_accessibility_complete.h
+++ b/content/renderer/accessibility/renderer_accessibility_complete.h
@@ -70,6 +70,7 @@ class CONTENT_EXPORT RendererAccessibilityComplete
   void OnSetFocus(int acc_obj_id);
   void OnSetTextSelection(int acc_obj_id, int start_offset, int end_offset);
   void OnHitTest(gfx::Point point);
+  void OnReset();
   void OnFatalError();
 
   // Events from Blink are collected until they are ready to be
@@ -93,6 +94,9 @@ class CONTENT_EXPORT RendererAccessibilityComplete
   // Set if we are waiting for an accessibility event ack.
   bool ack_pending_;
 
+  // Set if the browser requested we reset the accessibility state.
+  bool needs_reset_;
+
   // So we can queue up tasks to be executed later.
   base::WeakPtrFactory<RendererAccessibilityComplete> weak_factory_;