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

third_party/closure_compiler/externs/automation.js

Index: third_party/closure_compiler/externs/automation.js
diff --git a/third_party/closure_compiler/externs/automation.js b/third_party/closure_compiler/externs/automation.js
index 02560822ce0d9624b2c3bd9096cda1b72454c26a..0a3a0fcb588fa2177cc9019933ac9e3bc24d4f21 100644
--- a/third_party/closure_compiler/externs/automation.js
+++ b/third_party/closure_compiler/externs/automation.js
@@ -990,6 +990,16 @@ chrome.automation.AutomationNode.prototype.focus = function() {};
 chrome.automation.AutomationNode.prototype.getImageData = function(maxWidth, maxHeight) {};
 
 /**
+ * Does a hit test of the given global screen coordinates, and fires eventToFire
+ * on the resulting object.
+ * @param {number} x
+ * @param {number} y
+ * @param {!chrome.automation.EventType} eventToFire
+ * @see https://developer.chrome.com/extensions/automation#method-hitTest
+ */
+chrome.automation.AutomationNode.prototype.hitTest = function(x, y, eventToFire) {};
+
+/**
  * Scrolls this node to make it visible.
  * @see https://developer.chrome.com/extensions/automation#method-makeVisible
  */