cc: Introduce BeginFrame sequence numbers and acknowledgements.

cc/test/begin_frame_args_test.cc

Index: cc/test/begin_frame_args_test.cc
diff --git a/cc/test/begin_frame_args_test.cc b/cc/test/begin_frame_args_test.cc
index 8b4dfd3bd97ccb73b11c93653deb11220b76e2c1..d3e1fd3deb87680096bddab654f6a403e6a2d5aa 100644
--- a/cc/test/begin_frame_args_test.cc
+++ b/cc/test/begin_frame_args_test.cc
@@ -12,15 +12,20 @@
 namespace cc {
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
-    BeginFrameArgs::CreationLocation location) {
-  return CreateBeginFrameArgsForTesting(location, base::TimeTicks::Now());
+    BeginFrameArgs::CreationLocation location,
+    uint64_t source_id,
+    uint64_t sequence_number) {
+  return CreateBeginFrameArgsForTesting(location, source_id, sequence_number,
+                                        base::TimeTicks::Now());
 }
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
     BeginFrameArgs::CreationLocation location,
+    uint64_t source_id,
+    uint64_t sequence_number,
     base::TimeTicks frame_time) {
   return BeginFrameArgs::Create(
-      location, frame_time,
+      location, source_id, sequence_number, frame_time,
       frame_time + BeginFrameArgs::DefaultInterval() -
           BeginFrameArgs::DefaultEstimatedParentDrawTime(),
       BeginFrameArgs::DefaultInterval(), BeginFrameArgs::NORMAL);
@@ -28,40 +33,51 @@ BeginFrameArgs CreateBeginFrameArgsForTesting(
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
     BeginFrameArgs::CreationLocation location,
+    uint64_t source_id,
+    uint64_t sequence_number,
     int64_t frame_time,
     int64_t deadline,
     int64_t interval) {
-  return BeginFrameArgs::Create(
-      location, base::TimeTicks::FromInternalValue(frame_time),
-      base::TimeTicks::FromInternalValue(deadline),
-      base::TimeDelta::FromInternalValue(interval), BeginFrameArgs::NORMAL);
+  return BeginFrameArgs::Create(location, source_id, sequence_number,
+                                base::TimeTicks::FromInternalValue(frame_time),
+                                base::TimeTicks::FromInternalValue(deadline),
+                                base::TimeDelta::FromInternalValue(interval),
+                                BeginFrameArgs::NORMAL);
 }
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
     BeginFrameArgs::CreationLocation location,
+    uint64_t source_id,
+    uint64_t sequence_number,
     int64_t frame_time,
     int64_t deadline,
     int64_t interval,
     BeginFrameArgs::BeginFrameArgsType type) {
-  return BeginFrameArgs::Create(
-      location, base::TimeTicks::FromInternalValue(frame_time),
-      base::TimeTicks::FromInternalValue(deadline),
-      base::TimeDelta::FromInternalValue(interval), type);
+  return BeginFrameArgs::Create(location, source_id, sequence_number,
+                                base::TimeTicks::FromInternalValue(frame_time),
+                                base::TimeTicks::FromInternalValue(deadline),
+                                base::TimeDelta::FromInternalValue(interval),
+                                type);
 }
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
     BeginFrameArgs::CreationLocation location,
+    uint64_t source_id,
+    uint64_t sequence_number,
     base::SimpleTestTickClock* now_src) {
   base::TimeTicks now = now_src->NowTicks();
   return BeginFrameArgs::Create(
-      location, now, now + BeginFrameArgs::DefaultInterval() -
-                         BeginFrameArgs::DefaultEstimatedParentDrawTime(),
+      location, source_id, sequence_number, now,
+      now + BeginFrameArgs::DefaultInterval() -
+          BeginFrameArgs::DefaultEstimatedParentDrawTime(),
       BeginFrameArgs::DefaultInterval(), BeginFrameArgs::NORMAL);
 }
 
 bool operator==(const BeginFrameArgs& lhs, const BeginFrameArgs& rhs) {
-  return (lhs.type == rhs.type) && (lhs.frame_time == rhs.frame_time) &&
-         (lhs.deadline == rhs.deadline) && (lhs.interval == rhs.interval);
+  return (lhs.type == rhs.type) && (lhs.source_id == rhs.source_id) &&
+         (lhs.sequence_number == rhs.sequence_number) &&
+         (lhs.frame_time == rhs.frame_time) && (lhs.deadline == rhs.deadline) &&
+         (lhs.interval == rhs.interval);
 }
 
 ::std::ostream& operator<<(::std::ostream& os, const BeginFrameArgs& args) {
@@ -71,6 +87,7 @@ bool operator==(const BeginFrameArgs& lhs, const BeginFrameArgs& rhs) {
 
 void PrintTo(const BeginFrameArgs& args, ::std::ostream* os) {
   *os << "BeginFrameArgs(" << BeginFrameArgs::TypeToString(args.type) << ", "
+      << args.source_id << ", " << args.sequence_number << ", "
       << args.frame_time.ToInternalValue() << ", "
       << args.deadline.ToInternalValue() << ", "
       << args.interval.InMicroseconds() << "us)";