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

cc/test/layer_tree_test.cc

Index: cc/test/layer_tree_test.cc
diff --git a/cc/test/layer_tree_test.cc b/cc/test/layer_tree_test.cc
index d80c845c81ba9df175ca985fe88556c05ba3d57b..9ca0bbde14a5b4a453dc77b6f2f90218385cb151 100644
--- a/cc/test/layer_tree_test.cc
+++ b/cc/test/layer_tree_test.cc
@@ -23,6 +23,7 @@
 #include "cc/trees/layer_tree_host_impl.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "testing/gmock/include/gmock/gmock.h"
+#include "ui/gfx/frame_time.h"
 #include "ui/gfx/size_conversions.h"
 
 namespace cc {
@@ -591,7 +592,7 @@ void LayerTreeTest::DispatchComposite() {
   }
 
   schedule_when_set_visible_true_ = false;
-  base::TimeTicks now = base::TimeTicks::Now();
+  base::TimeTicks now = gfx::FrameTime::Now();
   layer_tree_host_->Composite(now);
 }