Add support for retrieving image thumbnails as part of the accessibility tree.

chrome/browser/extensions/api/automation_internal/automation_internal_api.cc

 // 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.
 
 #include "chrome/browser/extensions/api/automation_internal/automation_internal_api.h"
 
 #include <stdint.h>
 
 #include <vector>
 
@@ skipping 342 matching lines @@
   action.target_node_id = params->args.automation_node_id;
   switch (params->args.action_type) {
     case api::automation_internal::ACTION_TYPE_DODEFAULT:
       action.action = ui::AX_ACTION_DO_DEFAULT;
       adapter->PerformAction(action);
       break;
     case api::automation_internal::ACTION_TYPE_FOCUS:
       action.action = ui::AX_ACTION_FOCUS;
       adapter->PerformAction(action);
       break;
+    case api::automation_internal::ACTION_TYPE_GETIMAGEDATA: {
+      api::automation_internal::GetImageDataParams get_image_data_params;
+      EXTENSION_FUNCTION_VALIDATE(
+          api::automation_internal::GetImageDataParams::Populate(
+              params->opt_args.additional_properties, &get_image_data_params));
+      action.action = ui::AX_ACTION_GET_IMAGE_DATA;
+      action.target_rect = gfx::Rect(
+          0, 0, get_image_data_params.max_width,
+          get_image_data_params.max_height);
+      adapter->PerformAction(action);
+      break;
+    }
     case api::automation_internal::ACTION_TYPE_MAKEVISIBLE:
       action.action = ui::AX_ACTION_SCROLL_TO_MAKE_VISIBLE;
       adapter->PerformAction(action);
       break;
     case api::automation_internal::ACTION_TYPE_SETSELECTION: {
       api::automation_internal::SetSelectionParams selection_params;
       EXTENSION_FUNCTION_VALIDATE(
           api::automation_internal::SetSelectionParams::Populate(
               params->opt_args.additional_properties, &selection_params));
       action.anchor_node_id = params->args.automation_node_id;
@@ skipping 92 matching lines @@
   if (!error.empty()) {
     Respond(Error(error));
     return;
   }
 
   Respond(
       OneArgument(base::MakeUnique<base::FundamentalValue>(result_acc_obj_id)));
 }
 
 }  // namespace extensions