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;
+    // automationNodeID of performActionRequiredParams is used for the

[David Tseng, 2015/09/23 17:57:41]

nit: one space between sentences in this file.
Comment is somewhat confusing. Maybe
Reuses ActionRequiredParams automationNodeID to mean anchor node id, and treeID
to apply to both anchor and focus node id's.

+    // anchor node ID.  treeID applies to focusNodeID as well.
+    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);
   };
 };