Generalize the HIT_TEST accessibility action so that it can send any event.

content/browser/accessibility/browser_accessibility_manager.h

Index: content/browser/accessibility/browser_accessibility_manager.h
diff --git a/content/browser/accessibility/browser_accessibility_manager.h b/content/browser/accessibility/browser_accessibility_manager.h
index 02652d00b1c0b239cd3f6d9b70ecca7120da2938..061976196eec0b430a21db71ee6fbd4eaf22eb23 100644
--- a/content/browser/accessibility/browser_accessibility_manager.h
+++ b/content/browser/accessibility/browser_accessibility_manager.h
@@ -231,7 +231,9 @@ class CONTENT_EXPORT BrowserAccessibilityManager : public ui::AXTreeDelegate {
   // Called in response to a hit test, when the object hit has a child frame
   // (like an iframe element or browser plugin), and we need to do another
   // hit test recursively.
-  void OnChildFrameHitTestResult(const gfx::Point& point, int hit_obj_id);
+  void OnChildFrameHitTestResult(const gfx::Point& point,
+                                 int hit_obj_id,
+                                 ui::AXEvent event_to_fire);
 
   // This is called when the user has committed to a find in page query,
   // e.g. by pressing enter or tapping on the next / previous result buttons.