First tests for GCIdleTimeHandler.

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 bc196ce93a181e15dce8817a651ec00a9bae42f3..0ee803423ac26fa5264b6c3a9ce623803e9b698e 100644
--- a/src/heap/gc-idle-time-handler.h
+++ b/src/heap/gc-idle-time-handler.h
@@ -83,7 +83,7 @@ class GCIdleTimeHandler {
   static const size_t kInitialConservativeMarkCompactSpeed = 2 * MB;
 
   // Maximum mark-compact time returned by EstimateMarkCompactTime.
-  static const size_t kMaxMarkCompactTimeInMs = 1000000;
+  static const size_t kMaxMarkCompactTimeInMs;
 
   // Minimum time to finalize sweeping phase. The main thread may wait for
   // sweeper threads.
@@ -95,14 +95,15 @@ class GCIdleTimeHandler {
     bool incremental_marking_stopped;
     bool can_start_incremental_marking;
     bool sweeping_in_progress;
+    size_t mark_compact_speed_in_bytes_per_ms;
+    size_t incremental_marking_speed_in_bytes_per_ms;
   };
 
   GCIdleTimeHandler()
       : mark_compacts_since_idle_round_started_(0),
         scavenges_since_last_idle_round_(0) {}
 
-  GCIdleTimeAction Compute(size_t idle_time_in_ms, HeapState heap_state,
-                           GCTracer* gc_tracer);
+  GCIdleTimeAction Compute(size_t idle_time_in_ms, HeapState heap_state);
 
   void NotifyIdleMarkCompact() {
     if (mark_compacts_since_idle_round_started_ < kMaxMarkCompactsInIdleRound) {