Start incremental marking in long idle notification for background tab

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index ce0ec0be916ee168947c95e4ff263d512b3e5118..c9e7359d5749f86126cc7e8675369212bab95c34 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -4976,6 +4976,15 @@ bool Heap::IdleNotification(double deadline_in_seconds) {
   double start_ms = MonotonicallyIncreasingTimeInMs();
   double idle_time_in_ms = deadline_in_ms - start_ms;
 
+  if (idle_time_in_ms >= GCIdleTimeHandler::kMinBackgroundIdleTime) {
+    MemoryReducer::Event event;
+    event.type = MemoryReducer::kBackgroundIdleNotification;
+    event.time_ms = start_ms;
+    event.can_start_incremental_gc = incremental_marking()->IsStopped() &&
+                                     incremental_marking()->CanBeActivated();
+    memory_reducer_.NotifyBackgroundIdleNotification(event);
+  }

[Hannes Payer (out of office), 2015/07/07 07:49:34]

Let's make this block a method to keep IdleNotification small and readable.

[ulan, 2015/07/07 11:58:26]

Done.

+
   tracer()->SampleAllocation(start_ms, NewSpaceAllocationCounter(),
                              OldGenerationAllocationCounter());