base: Add AsList() function to Value API.

chrome/test/base/ui_test_utils.cc

 // Copyright (c) 2011 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/test/base/ui_test_utils.h"
 
 #include <vector>
 
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 188 matching lines @@
   // Nothing more to do for callers that ignore the returned JS value.
   if (!result)
     return true;
 
   // Wrap |json| in an array before deserializing because valid JSON has an
   // array or an object as the root.
   json.insert(0, "[");
   json.append("]");
 
   scoped_ptr<Value> root_val(base::JSONReader::Read(json, true));
-  if (!root_val->IsType(Value::TYPE_LIST))
+  ListValue* list = root_val->AsList();
+  if (!list)
     return false;
 
-  ListValue* list = static_cast<ListValue*>(root_val.get());
   Value* result_val;
   if (!list || !list->GetSize() ||
       !list->Remove(0, &result_val))  // Remove gives us ownership of the value.
     return false;
 
   result->reset(result_val);
   return true;
 }
 
 }  // namespace
@@ skipping 726 matching lines @@
         L"window.domAutomationController.send("
         L"    JSON.stringify([document.width, document.height]))";
     std::string json;
     if (!ui_test_utils::ExecuteJavaScriptAndExtractString(
             rvh, L"", script, &json))
       return false;
 
     // Parse the JSON.
     std::vector<int> dimensions;
     scoped_ptr<Value> value(base::JSONReader::Read(json, true));
-    if (!value->IsType(Value::TYPE_LIST))
+    ListValue* list = value->AsList();
+    if (!list)
       return false;
-    ListValue* list = static_cast<ListValue*>(value.get());
     int width, height;
     if (!list->GetInteger(0, &width) || !list->GetInteger(1, &height))
       return false;
 
     // Take the snapshot.
     gfx::Size page_size(width, height);
     return TakeRenderWidgetSnapshot(rvh, page_size, page_size, bitmap);
   }
 
  private:
@@ skipping 20 matching lines @@
   return taker.TakeRenderWidgetSnapshot(rwh, page_size, page_size, bitmap);
 }
 
 bool TakeEntirePageSnapshot(RenderViewHost* rvh, SkBitmap* bitmap) {
   DCHECK(bitmap);
   SnapshotTaker taker;
   return taker.TakeEntirePageSnapshot(rvh, bitmap);
 }
 
 }  // namespace ui_test_utils