Add message sizing to basic IPC traits and struct macros.

ipc/ipc_message_utils_unittest.cc

 // Copyright (c) 2012 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 "ipc/ipc_message_utils.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/files/file_path.h"
@@ skipping 72 matching lines @@
   IPC::Message msg(1, 2, IPC::Message::PRIORITY_NORMAL);
   IPC::WriteParam(&msg, stack_vector);
 
   base::StackVector<double, stack_capacity> output;
   base::PickleIterator iter(msg);
   EXPECT_TRUE(IPC::ReadParam(&msg, &iter, &output));
   for (size_t i = 0; i < 2 * stack_capacity; i++)
     EXPECT_EQ(stack_vector[i], output[i]);
 }
 
+// Tests that PickleSizer and Pickle agree on the size of a complex base::Value.
+TEST(IPCMessageUtilsTest, ValueSize) {
+  scoped_ptr<base::DictionaryValue> value(new base::DictionaryValue);
+  value->SetWithoutPathExpansion("foo", new base::FundamentalValue(42));
+  value->SetWithoutPathExpansion("bar", new base::FundamentalValue(3.14));
+  value->SetWithoutPathExpansion("baz", new base::StringValue("hello"));
+  value->SetWithoutPathExpansion("qux", base::Value::CreateNullValue());
+
+  scoped_ptr<base::DictionaryValue> nested_dict(new base::DictionaryValue);
+  nested_dict->SetWithoutPathExpansion("foobar", new base::FundamentalValue(5));
+  value->SetWithoutPathExpansion("nested", std::move(nested_dict));
+
+  scoped_ptr<base::ListValue> list_value(new base::ListValue);
+  list_value->Append(new base::StringValue("im a string"));
+  list_value->Append(new base::StringValue("im another string"));
+  value->SetWithoutPathExpansion("awesome-list", std::move(list_value));
+
+  base::Pickle pickle;
+  IPC::WriteParam(&pickle, *value);
+
+  base::PickleSizer sizer;
+  IPC::GetParamSize(&sizer, *value);
+
+  EXPECT_EQ(sizer.payload_size(), pickle.payload_size());
+}
+
 }  // namespace
 }  // namespace IPC