gfx: Add FrameTime and DisplayTime classes

cc/scheduler/frame_rate_controller.cc

Index: cc/scheduler/frame_rate_controller.cc
diff --git a/cc/scheduler/frame_rate_controller.cc b/cc/scheduler/frame_rate_controller.cc
index 2729748859bf030b1c5cd88576542ef1b6d7f782..1c81bfd4080176d2d9214db09e265ca45e552bb6 100644
--- a/cc/scheduler/frame_rate_controller.cc
+++ b/cc/scheduler/frame_rate_controller.cc
@@ -74,9 +74,11 @@ BeginFrameArgs FrameRateController::SetActive(bool active) {
   active_ = active;
 
   if (is_time_source_throttling_) {
-    base::TimeTicks missed_tick_time = time_source_->SetActive(active);
+    gfx::FrameTime missed_tick_time =
+        gfx::FrameTime::Unsafe_FromTimeTicks(
+            time_source_->SetActive(active));
     if (!missed_tick_time.is_null()) {
-      base::TimeTicks deadline = NextTickTime();
+      gfx::FrameTime deadline = NextTickTime();
       return  BeginFrameArgs::Create(
           missed_tick_time, deadline + deadline_adjustment_, interval_);
     }
@@ -117,8 +119,8 @@ void FrameRateController::OnTimerTick() {
 
   if (client_) {
     // TODO(brianderson): Use an adaptive parent compositor deadline.
-    base::TimeTicks frame_time = LastTickTime();
-    base::TimeTicks deadline = NextTickTime();
+    gfx::FrameTime frame_time = LastTickTime();
+    gfx::FrameTime deadline = NextTickTime();
     BeginFrameArgs args = BeginFrameArgs::Create(
         frame_time, deadline + deadline_adjustment_, interval_);
     client_->FrameRateControllerTick(throttled, args);
@@ -155,16 +157,19 @@ void FrameRateController::DidAbortAllPendingFrames() {
   num_frames_pending_ = 0;
 }
 
-base::TimeTicks FrameRateController::NextTickTime() {
-  if (is_time_source_throttling_)
-    return time_source_->NextTickTime();
+gfx::FrameTime FrameRateController::NextTickTime() {
+  if (is_time_source_throttling_) {
+    return gfx::FrameTime::Unsafe_FromTimeTicks(
+        time_source_->NextTickTime());
+  }
 
-  return base::TimeTicks();
+  return gfx::FrameTime();
 }
 
-base::TimeTicks FrameRateController::LastTickTime() {
+gfx::FrameTime FrameRateController::LastTickTime() {
   if (is_time_source_throttling_)
-    return time_source_->LastTickTime();
+    return gfx::FrameTime::Unsafe_FromTimeTicks(
+        time_source_->LastTickTime());
 
   return gfx::FrameTime::Now();
 }