Fix black background when locking with fullscreen window:

base/time.h

Index: base/time.h
diff --git a/base/time.h b/base/time.h
index 78d7456b68ae273c3bf27e8aaf93cd3742efe02c..09788326895ea64604c62a4e165edcfd541a6aa7 100644
--- a/base/time.h
+++ b/base/time.h
@@ -638,6 +638,20 @@ inline TimeTicks TimeDelta::operator+(TimeTicks t) const {
   return TimeTicks(t.ticks_ + delta_);
 }
 
+// TimeFactory ----------------------------------------------------------------
+
+class BASE_EXPORT TimeFactory {

[brettw, 2012/12/12 00:35:09]

Can you add a comment for this about what it's for? You should also explain the
thing about the instance_ and how it gets installed.

[Denis Kuznetsov (DE-MUC), 2012/12/12 19:20:12]

Done.

+ public:
+  virtual Time TimeNow() = 0;
+  virtual TimeTicks TimeTicksNow() = 0;
+  virtual TimeTicks TimeTicksHighResNow() = 0;

[brettw, 2012/12/12 00:35:09]

I'd not bother with this, it makes it more difficult to write a test impl and I
don't think there's any need for tests to do anything different for regular/high
res ticks. So just have both the Now and HighResNow call through to the same
factory function.

[Denis Kuznetsov (DE-MUC), 2012/12/12 19:20:12]

Done.

+
+  static TimeFactory* instance() { return instance_; }
+
+ protected:
+  static TimeFactory* instance_;
+};
+
 }  // namespace base
 
 #endif  // BASE_TIME_H_