cc: Use HighResNow as timebase if it is fast and reliable

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index 3240028aa27f0f1265081f61c5ca13fcccf5a6cd..4f90cda8b4aa74067cc25f16441aacfa84d23b8b 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -9,6 +9,7 @@
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "cc/debug/traced_value.h"
+#include "ui/gfx/frame_time.h"
 
 namespace cc {
 
@@ -118,7 +119,7 @@ base::TimeTicks Scheduler::AnticipatedDrawTime() {
       last_begin_frame_args_.interval <= base::TimeDelta())
     return base::TimeTicks();
 
-  base::TimeTicks now = base::TimeTicks::Now();
+  base::TimeTicks now = gfx::FrameTime::Now();
   base::TimeTicks timebase = std::max(last_begin_frame_args_.frame_time,
                                       last_begin_frame_args_.deadline);
   int64 intervals = 1 + ((now - timebase) / last_begin_frame_args_.interval);