base: Add AsList() function to Value API.

base/values_unittest.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 <limits>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 411 matching lines @@
   ASSERT_EQ(original_binary->GetSize(),
     static_cast<BinaryValue*>(copy_binary)->GetSize());
   ASSERT_EQ(0, memcmp(original_binary->GetBuffer(),
                static_cast<BinaryValue*>(copy_binary)->GetBuffer(),
                original_binary->GetSize()));
 
   Value* copy_value = NULL;
   ASSERT_TRUE(copy_dict->Get("list", &copy_value));
   ASSERT_TRUE(copy_value);
   ASSERT_NE(copy_value, original_list);
-  ASSERT_TRUE(copy_value->IsType(Value::TYPE_LIST));
-  ListValue* copy_list = static_cast<ListValue*>(copy_value);
+  ListValue* copy_list = copy_value->AsList();
+  ASSERT_TRUE(copy_list != NULL);
   ASSERT_EQ(2U, copy_list->GetSize());
 
   Value* copy_list_element_0;
   ASSERT_TRUE(copy_list->Get(0, &copy_list_element_0));
   ASSERT_TRUE(copy_list_element_0);
   ASSERT_NE(copy_list_element_0, original_list_element_0);
   int copy_list_element_0_value;
   ASSERT_TRUE(copy_list_element_0->GetAsInteger(&copy_list_element_0_value));
   ASSERT_EQ(0, copy_list_element_0_value);
 
@@ skipping 243 matching lines @@
   std::string sub_collide_key_value;
   EXPECT_TRUE(res_sub_dict->GetString("sub_collide_key",
                                       &sub_collide_key_value));
   EXPECT_EQ("sub_collide_key_value_merge", sub_collide_key_value); // Replaced.
   std::string sub_merge_key_value;
   EXPECT_TRUE(res_sub_dict->GetString("sub_merge_key", &sub_merge_key_value));
   EXPECT_EQ("sub_merge_key_value_merge", sub_merge_key_value); // Merged in.
 }
 
 }  // namespace base