Revert of Don't use barcodes in ProtocolPerfTests

remoting/test/scroll_frame_generator.cc

Index: remoting/test/scroll_frame_generator.cc
diff --git a/remoting/test/scroll_frame_generator.cc b/remoting/test/scroll_frame_generator.cc
index 01e0af239da995088c13a81b431462598aaa8c7d..1a6a1ec0b6834d89306d5a3dffc81980f8141410 100644
--- a/remoting/test/scroll_frame_generator.cc
+++ b/remoting/test/scroll_frame_generator.cc
@@ -41,12 +41,19 @@
   result->mutable_updated_region()->SetRect(
       webrtc::DesktopRect::MakeSize(result->size()));
 
+  ++last_frame_id_;
+  frame_timestamp_[last_frame_id_] = now;
+  DrawBarcode(last_frame_id_, true, result.get());
+
   return result;
 }
 
-protocol::InputEventTimestamps ScrollFrameGenerator::TakeLastEventTimestamps() {
-  base::TimeTicks now = base::TimeTicks::Now();
-  return protocol::InputEventTimestamps{now, now};
+base::TimeDelta ScrollFrameGenerator::GetFrameLatency(
+    const webrtc::DesktopFrame& frame) {
+  int frame_id = ReadBarcode(frame);
+  if (!frame_timestamp_.count(frame_id))
+    LOG(FATAL) << "Unknown frame_id.";
+  return base::TimeTicks::Now() - frame_timestamp_[frame_id];
 }
 
 }  // namespace test