In chromedriver, add /log handler

chrome/test/webdriver/webdriver_logging.cc

Index: chrome/test/webdriver/webdriver_logging.cc
diff --git a/chrome/test/webdriver/webdriver_logging.cc b/chrome/test/webdriver/webdriver_logging.cc
new file mode 100644
index 0000000000000000000000000000000000000000..ffd53413571258e71ef47e7ab5e1283ad22770eb
--- /dev/null
+++ b/chrome/test/webdriver/webdriver_logging.cc
@@ -0,0 +1,41 @@
+// 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 "chrome/test/webdriver/webdriver_logging.h"
+
+#include "base/file_path.h"
+#include "base/file_util.h"
+#include "base/logging.h"
+
+namespace {
+
+// Path to the WebDriver log file.
+const FilePath::CharType kLogPath[] = FILE_PATH_LITERAL("chromedriver.log");
+
+}  // namespace
+
+namespace webdriver {
+
+void InitWebDriverLogging(int min_log_level) {
+  bool success = InitLogging(
+      kLogPath,
+      logging::LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG,
+      logging::LOCK_LOG_FILE,
+      logging::DELETE_OLD_LOG_FILE,
+      logging::DISABLE_DCHECK_FOR_NON_OFFICIAL_RELEASE_BUILDS);
+  if (!success) {
+    PLOG(ERROR) << "Unable to initialize logging";
+  }
+  logging::SetLogItems(false,  // enable_process_id
+                       false,  // enable_thread_id
+                       true,   // enable_timestamp
+                       false); // enable_tickcount
+  logging::SetMinLogLevel(min_log_level);
+}
+
+bool GetLogContents(std::string* log_contents) {
+  return file_util::ReadFileToString(FilePath(kLogPath), log_contents);
+}
+
+}  // namespace webdriver