Add setSelection function to automation API.

chrome/common/extensions/api/automation_internal.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is the implementation layer of the chrome.automation API, and is
 // essentially a translation of the internal accessibility tree update system
 // into an extension API.
 namespace automationInternal {
   // Data for an accessibility event and/or an atomic change to an accessibility
   // tree. See ui/accessibility/ax_tree_update.h for an extended explanation of
@@ skipping 18 matching lines @@
     showContextMenu
   };
 
   // Arguments required for all actions supplied to performAction.
   dictionary PerformActionRequiredParams {
     long treeID;
     long automationNodeID;
     ActionType actionType;
   };
 
-  // Arguments for the set_selection action supplied to performAction.
+  // Arguments for the setSelection action supplied to performAction.
   dictionary SetSelectionParams {
-    long startIndex;
-    long endIndex;
+    // Reuses ActionRequiredParams automationNodeID to mean anchor node id,
+    // and treeID to apply to both anchor and focus node ids.
+    long focusNodeID;
+    long anchorOffset;
+    long focusOffset;
   };
 
   // Arguments for the querySelector function.
   dictionary QuerySelectorRequiredParams {
     long treeID;
     long automationNodeID;
     DOMString selector;
   };
 
   // Arguments for the enableTab function.
@@ skipping 37 matching lines @@
 
   interface Events {
     // Fired when an accessibility event occurs
     static void onAccessibilityEvent(AXEventParams update);
 
     static void onAccessibilityTreeDestroyed(long treeID);
 
     static void onTreeChange(long treeID, long nodeID, DOMString changeType);
   };
 };