Fix black background when locking with fullscreen window:

base/time_posix.cc

Index: base/time_posix.cc
diff --git a/base/time_posix.cc b/base/time_posix.cc
index b6a12501212e64cee0686d0aaa6d04d581b141dd..a842e7dadf411aa0ca380d6fe9e3d6bdea7c4927 100644
--- a/base/time_posix.cc
+++ b/base/time_posix.cc
@@ -111,6 +111,9 @@ const int64 Time::kTimeTToMicrosecondsOffset = kWindowsEpochDeltaMicroseconds;
 
 // static
 Time Time::Now() {
+  if (TimeFactory::instance())
+    return TimeFactory::instance()->TimeNow();
+
   struct timeval tv;
   struct timezone tz = { 0, 0 };  // UTC
   if (gettimeofday(&tv, &tz) != 0) {
@@ -237,6 +240,9 @@ Time Time::FromExploded(bool is_local, const Exploded& exploded) {
 
 // static
 TimeTicks TimeTicks::Now() {
+  if (TimeFactory::instance())
+    return TimeFactory::instance()->TimeTicksNow();
+
   uint64_t absolute_micro;
 
   struct timespec ts;