Ensure in use params are in cache

Cache might have removed all params stored in in_use_compatible_params_,
depending when we have last tried to get them from cache.
This was failing some of the DCHECKS in place.

Tested by playing Video and scrolling the page up/down till we hit the
maximum cache size of 100.

Review URL: https://codereview.chromium.org/1375963006

Cr-Commit-Position: refs/heads/master@{#353812}

ui/ozone/platform/drm/host/drm_overlay_candidates_host.cc

@@ -241,6 +241,11 @@ uint32_t DrmOverlayCandidatesHost::CalculateCandidateWeight(
 
 void DrmOverlayCandidatesHost::ValidateCandidates(
     OverlaySurfaceCandidateList* candidates) {
+  // Make sure params being currently used are in cache. They might have been
+  // removed in case we haven't tried to get them from cache for a while.
+  for (const auto& param : in_use_compatible_params_)
+    cache_.Put(param.first, true);
+
   in_use_compatible_params_.clear();
   typedef std::pair<OverlaySurfaceCandidate*, OverlayCheck_Params>
       CandidatePair;