Add headless chrome as an accepted browser string in chromedriver.

chrome/test/chromedriver/chrome/browser_info_unittest.cc

 // Copyright (c) 2013 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/chromedriver/chrome/browser_info.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
@@ skipping 85 matching lines @@
   Status status =
       ParseBrowserString(false, "Chrome/39.0.2171.59", &browser_info);
   ASSERT_TRUE(status.IsOk());
   ASSERT_EQ("chrome", browser_info.browser_name);
   ASSERT_EQ("39.0.2171.59", browser_info.browser_version);
   ASSERT_EQ(39, browser_info.major_version);
   ASSERT_EQ(2171, browser_info.build_no);
   ASSERT_FALSE(browser_info.is_android);
 }
 
+TEST(ParseBrowserString, HeadlessChrome) {
+  BrowserInfo browser_info;
+  Status status =
+      ParseBrowserString(false, "HeadlessChrome/39.0.2171.59", &browser_info);
+  ASSERT_TRUE(status.IsOk());
+  ASSERT_EQ("headless chrome", browser_info.browser_name);
+  ASSERT_EQ("39.0.2171.59", browser_info.browser_version);
+  ASSERT_EQ(39, browser_info.major_version);
+  ASSERT_EQ(2171, browser_info.build_no);
+  ASSERT_FALSE(browser_info.is_android);
+}
+
 TEST(ParseBlinkVersionString, GitHash) {
   int rev = -1;
   Status status = ParseBlinkVersionString(
       "537.36 (@28f741cfcabffe68a9c12c4e7152569c906bd88f)", &rev);
   ASSERT_TRUE(status.IsOk());
   ASSERT_EQ(-1, rev);
 }
 
 TEST(ParseBlinkVersionString, SvnRevision) {
   int blink_revision = -1;
@@ skipping 10 matching lines @@
   ASSERT_TRUE(IsGitHash("1493aa5"));
 }
 
 TEST(IsGitHash, GitHashWithUpperCaseCharacters) {
   ASSERT_TRUE(IsGitHash("28F741CFCABFFE68A9C12C4E7152569C906BD88F"));
 }
 
 TEST(IsGitHash, SvnRevision) {
   ASSERT_FALSE(IsGitHash("159105"));
 }