Add build and patch to Chrome-Proxy header

chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_unittest.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/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+const char kVersion[] = "1.2.3.4";
+const char kExpectedBuildAndPatch[] = "3.4";
+
+class DataReductionProxyChromeSettingsTest : public testing::Test {
+ public:
+  DataReductionProxyChromeSettingsTest() {}
+};
+
+TEST_F(DataReductionProxyChromeSettingsTest, TestGetBuildAndPatchNumber) {
+  std::string build_and_patch =
+      DataReductionProxyChromeSettings::GetBuildAndPatchNumberFromString(
+          kVersion);
+  EXPECT_EQ(kExpectedBuildAndPatch, build_and_patch);
+
+  build_and_patch =
+      DataReductionProxyChromeSettings::GetBuildAndPatchNumberFromString(
+          "0.0");

[bengr, 2014/09/02 23:16:14]

nit: define kBogusVersion[] = "0.0"

+  EXPECT_EQ(std::string(), build_and_patch);
+}