Add option for not adding '.0' to the end of doubles that have no fractional

base/json/json_writer_unittest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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 "base/json/json_writer.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 TEST(JSONWriterTest, Writing) {
@@ skipping 100 matching lines @@
   ASSERT_EQ("[5,2]", output_js);
 
   DictionaryValue binary_dict;
   binary_dict.Set("a", Value::CreateIntegerValue(5));
   binary_dict.Set("b", BinaryValue::CreateWithCopiedBuffer("asdf", 4));
   binary_dict.Set("c", Value::CreateIntegerValue(2));
   JSONWriter::WriteWithOptions(&binary_dict, false,
                                JSONWriter::OPTIONS_OMIT_BINARY_VALUES,
                                &output_js);
   ASSERT_EQ("{\"a\":5,\"c\":2}", output_js);
+
+  // Test allowing a double with no fractional part to be written as an integer.
+  FundamentalValue double_value(1e10);
+  JSONWriter::WriteWithOptions(
+      &double_value, false,
+      JSONWriter::OPTIONS_OMIT_DOUBLE_TYPE_PRESERVATION,
+      &output_js);
+  ASSERT_EQ("10000000000", output_js);
 }
 
 }  // namespace base