Use smaller heap growing factor in idle notification to start incremental marking when there is idl…

src/heap/gc-idle-time-handler.h

Index: src/heap/gc-idle-time-handler.h
diff --git a/src/heap/gc-idle-time-handler.h b/src/heap/gc-idle-time-handler.h
index f953c87b3b81049345b2f23e15b451eb694c844d..a9e0e358257929becb822b2d6f70b0a4eff643b7 100644
--- a/src/heap/gc-idle-time-handler.h
+++ b/src/heap/gc-idle-time-handler.h
@@ -122,6 +122,9 @@ class GCIdleTimeHandler {
   // 16 ms when there is currently no rendering going on.
   static const size_t kMaxScheduledIdleTime = 50;
 
+  // The maximum idle time when frames are rendered is 16ms.
+  static const size_t kMaxFrameRenderingIdleTime = 16;

[Erik Corry Chromium.org, 2015/04/16 14:16:44]

It's 16 and two thirds.  I think you should go with 17 because rounding errors.

[Hannes Payer (out of office), 2015/04/16 14:46:45]

Done.

[Erik Corry, 2015/04/16 15:35:46]

It's actually 16⅔.  Should we use 17 here?

+
   // We conservatively assume that in the next kTimeUntilNextIdleEvent ms
   // no idle notification happens.
   static const size_t kTimeUntilNextIdleEvent = 100;