latency-info: Add a speculative fix.

Add a speculative fix in SurfaceAggregator::Aggregate() to make sure it
doesn't accumulate too many LatencyInfo objects.

BUG=834421

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ifd41d901050a954279b642cab972ca6ec6d560e2
Reviewed-on: https://chromium-review.googlesource.com/1053793Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557992}

components/viz/service/display/surface_aggregator.cc

@@ -1236,6 +1236,10 @@ CompositorFrame SurfaceAggregator::Aggregate(
     Surface* surface = manager_->GetSurfaceForId(it.first);
     if (surface)
       surface->TakeLatencyInfo(&frame.metadata.latency_info);
+    if (!ui::LatencyInfo::Verify(frame.metadata.latency_info,
+                                 "SurfaceAggregator::Aggregate")) {
+      break;
+    }
   }
 
   // TODO(jamesr): Aggregate all resource references into the returned frame's