Pipe impl_latency_takes_priority_ to the RenderScheduler.

cc/output/begin_frame_args.cc

Index: cc/output/begin_frame_args.cc
diff --git a/cc/output/begin_frame_args.cc b/cc/output/begin_frame_args.cc
index 4b43d94afe59c4388d2fb75a16478906faf50f78..216eb52587af2c5d5e509d4b11af8aa5b4989b85 100644
--- a/cc/output/begin_frame_args.cc
+++ b/cc/output/begin_frame_args.cc
@@ -27,7 +27,8 @@ BeginFrameArgs::BeginFrameArgs()
     : frame_time(base::TimeTicks()),
       deadline(base::TimeTicks()),
       interval(base::TimeDelta::FromMicroseconds(-1)),
-      type(BeginFrameArgs::INVALID) {
+      type(BeginFrameArgs::INVALID),
+      on_critical_path(true) {
 }
 
 BeginFrameArgs::BeginFrameArgs(base::TimeTicks frame_time,
@@ -37,7 +38,8 @@ BeginFrameArgs::BeginFrameArgs(base::TimeTicks frame_time,
     : frame_time(frame_time),
       deadline(deadline),
       interval(interval),
-      type(type) {
+      type(type),
+      on_critical_path(true) {
 }
 
 BeginFrameArgs BeginFrameArgs::Create(BeginFrameArgs::CreationLocation location,
@@ -73,6 +75,7 @@ void BeginFrameArgs::AsValueInto(base::trace_event::TracedValue* state) const {
 #ifndef NDEBUG
   state->SetString("created_from", created_from.ToString());
 #endif
+  state->SetBoolean("on_critical_path", on_critical_path);
 }
 
 // This is a hard-coded deadline adjustment that assumes 60Hz, to be used in