Layout tests expect the time to be relative to the unix epoch.

webkit/support/webkit_support.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 "webkit/support/webkit_support.h"
 
 #include "base/at_exit.h"
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 722 matching lines @@
 
  private:
   base::ScopedTempDir tempDirectory_;
 };
 
 ScopedTempDirectory* CreateScopedTempDirectory() {
   return new ScopedTempDirectoryInternal();
 }
 
 int64 GetCurrentTimeInMillisecond() {
-  return base::TimeTicks::Now().ToInternalValue()
-      / base::Time::kMicrosecondsPerMillisecond;
+  return base::TimeDelta(base::Time::Now() -
+                         base::Time::UnixEpoch()).ToInternalValue() /
+         base::Time::kMicrosecondsPerMillisecond;
 }
 
 std::string EscapePath(const std::string& path) {
   return net::EscapePath(path);
 }
 
 std::string MakeURLErrorDescription(const WebKit::WebURLError& error) {
   std::string domain = error.domain.utf8();
   int code = error.reason;
 
@@ skipping 126 matching lines @@
 // Logging
 void EnableWebCoreLogChannels(const std::string& channels) {
   webkit_glue::EnableWebCoreLogChannels(channels);
 }
 
 void SetGamepadData(const WebKit::WebGamepads& pads) {
   test_environment->webkit_platform_support()->setGamepadData(pads);
 }
 
 }  // namespace webkit_support