Add private extension API to move the accessibility focus ring.

chrome/common/extensions/api/accessibility_private.json

 // 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.
 
 [
   {
     "namespace": "accessibilityPrivate",
     "compiler_options": {
       "implemented_in": "chrome/browser/accessibility/accessibility_extension_api.h"
     },
@@ skipping 141 matching lines @@
               { "$ref": "MenuItemDetails" },
               { "$ref": "RadioButtonDetails" },
               { "$ref": "SliderDetails" },
               { "$ref": "TabDetails" },
               { "$ref": "TextBoxDetails" },
               { "$ref": "TreeDetails" },
               { "$ref": "TreeItemDetails" }
             ]
           }
         }
+      },
+      {
+        "id": "ScreenRect",
+        "type": "object",
+        "description": "Bounding rectangle in global screen coordinates.",
+        "properties": {
+          "left": {"type": "integer", "description": "Left coordinate in global screen coordinates."},
+          "top": {"type": "integer", "description": "Top coordinate in global screen coordinates."},
+          "width": {"type": "integer", "description": "Width in pixels."},
+          "height": {"type": "integer", "description": "Height in pixels."}
+        }
       }
     ],
     "functions": [
       {
         "name": "setAccessibilityEnabled",
         "type": "function",
         "description": "Enables or disables the accessibility extension api. This must be set to true before event listeners or getFocusedControl will work.",
         "parameters": [
           {
             "type": "boolean",
@@ skipping 49 matching lines @@
             "parameters": [
               {
                 "name": "alerts",
                 "type": "array",
                 "items": { "$ref": "AlertInfo" },
                 "description": "Alerts being shown on the given tab."
               }
             ]
           }
         ]
+      },
+      {
+        "name": "setFocusRing",
+        "type": "function",
+        "description": "Set the bounds of the accessibility focus ring.",
+        "parameters": [
+          {
+            "name": "rects",
+            "type": "array",
+            "items": { "$ref": "ScreenRect" },
+            "description": "Array of rectangles to draw the accessibility focus ring around."
+          }
+        ]
       }
     ],
     "events": [
       {
         "name": "onWindowOpened",
         "type": "function",
         "description": "Fired when a window is opened.",
         "parameters": [
           {
             "$ref": "AccessibilityObject",
@@ skipping 99 matching lines @@
           {
             "type": "boolean",
             "name": "makeAnnouncements",
             "description": "Whether to make introductory announcements."
           }
         ]
       }
     ]
   }
 ]