Fix black background when locking with fullscreen window:

base/time_mac.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 "base/time.h"
 
 #include <CoreFoundation/CFDate.h>
 #include <CoreFoundation/CFTimeZone.h>
 #include <mach/mach_time.h>
 #include <sys/sysctl.h>
@@ skipping 81 matching lines @@
 const int64 Time::kWindowsEpochDeltaMicroseconds =
     kWindowsEpochDeltaSeconds * Time::kMicrosecondsPerSecond;
 
 // Some functions in time.cc use time_t directly, so we provide an offset
 // to convert from time_t (Unix epoch) and internal (Windows epoch).
 // static
 const int64 Time::kTimeTToMicrosecondsOffset = kWindowsEpochDeltaMicroseconds;
 
 // static
 Time Time::Now() {
+  if (TimeFactory::instance())
+    return TimeFactory::instance()->TimeNow();
   return FromCFAbsoluteTime(CFAbsoluteTimeGetCurrent());
 }
 
 // static
 Time Time::FromCFAbsoluteTime(CFAbsoluteTime t) {
   if (t == 0)
     return Time();  // Consider 0 as a null Time.
   if (t == std::numeric_limits<CFAbsoluteTime>::max())
     return Max();
   return Time(static_cast<int64>(
@@ skipping 64 matching lines @@
   exploded->millisecond =
       (microsecond >= 0) ? microsecond / kMicrosecondsPerMillisecond :
                            (microsecond - kMicrosecondsPerMillisecond + 1) /
                                kMicrosecondsPerMillisecond;
 }
 
 // TimeTicks ------------------------------------------------------------------
 
 // static
 TimeTicks TimeTicks::Now() {
+  if (TimeFactory::instance())
+    return TimeFactory::instance()->TimeTicksNow();
   return TimeTicks(ComputeCurrentTicks());
 }
 
 // static
 TimeTicks TimeTicks::HighResNow() {
   return Now();
 }
 
 // static
 TimeTicks TimeTicks::NowFromSystemTraceTime() {
   return HighResNow();
 }
 
 }  // namespace base