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

chrome/common/extensions/api/automation_internal.idl

Index: chrome/common/extensions/api/automation_internal.idl
diff --git a/chrome/common/extensions/api/automation_internal.idl b/chrome/common/extensions/api/automation_internal.idl
index e6b1e8b10ffa19ad310b58194b5e7849f4f0bd33..a5cc24f88eec66a13ada0ff568b869e7aaa61b42 100644
--- a/chrome/common/extensions/api/automation_internal.idl
+++ b/chrome/common/extensions/api/automation_internal.idl
@@ -32,6 +32,7 @@ namespace automationInternal {
     focus,
     doDefault,
     getImageData,
+    hitTest,
     makeVisible,
     resumeMedia,
     setAccessibilityFocus,
@@ -72,12 +73,19 @@ namespace automationInternal {
     long? tabID;
   };
 
-  // Arguments for the getImageData function.
+  // Arguments for the getImageData action.
   dictionary GetImageDataParams {
     long maxWidth;
     long maxHeight;
   };
 
+  // Arguments for the hitTest action.
+  dictionary HitTestParams {
+    long x;
+    long y;
+    DOMString eventToFire;
+  };
+
   // Returns the accessibility tree id of the web contents who's accessibility
   // was enabled using enableTab().
   callback EnableTabCallback = void(long tree_id);