Temporarily revert to non-incremental GC in background tabs to see

src/heap/memory-reducer.cc

Index: src/heap/memory-reducer.cc
diff --git a/src/heap/memory-reducer.cc b/src/heap/memory-reducer.cc
index 6b0e1f8fed0cfb6190b5794666481ae0a5649d54..9fadd08dca3d1e564a96753b4f537885ca829d93 100644
--- a/src/heap/memory-reducer.cc
+++ b/src/heap/memory-reducer.cc
@@ -73,7 +73,14 @@ void MemoryReducer::NotifyTimer(const Event& event) {
       PrintIsolate(heap()->isolate(), "Memory reducer: started GC #%d\n",
                    state_.started_gcs);
     }
-    heap()->StartIdleIncrementalMarking();
+    if (heap()->ShouldOptimizeForMemoryUsage()) {
+      // TODO(ulan): Remove this once crbug.com/552305 is fixed.
+      // Do full GC if memory usage has higher priority than latency.
+      heap()->CollectAllGarbage(Heap::kReduceMemoryFootprintMask,
+                                "memory reducer");
+    } else {
+      heap()->StartIdleIncrementalMarking();
+    }
   } else if (state_.action == kWait) {
     if (!heap()->incremental_marking()->IsStopped() &&
         heap()->ShouldOptimizeForMemoryUsage()) {