Use an upper bound for marking time estimation in idle notification.

src/heap/gc-idle-time-handler-unittest.cc

Index: src/heap/gc-idle-time-handler-unittest.cc
diff --git a/src/heap/gc-idle-time-handler-unittest.cc b/src/heap/gc-idle-time-handler-unittest.cc
index b9989a8c46a1d689b977a7d80a7dfba4f71b8a30..56ff2f313cd3c5807df57a5b825af14f69b7da7d 100644
--- a/src/heap/gc-idle-time-handler-unittest.cc
+++ b/src/heap/gc-idle-time-handler-unittest.cc
@@ -32,8 +32,8 @@ class GCIdleTimeHandlerTest : public ::testing::Test {
   }
 
   static const size_t kSizeOfObjects = 100 * MB;
-  static const size_t kMarkCompactSpeed = 100 * KB;
-  static const size_t kMarkingSpeed = 100 * KB;
+  static const size_t kMarkCompactSpeed = 200 * KB;
+  static const size_t kMarkingSpeed = 200 * KB;
 
  private:
   GCIdleTimeHandler handler_;
@@ -87,7 +87,7 @@ TEST(GCIdleTimeHandler, EstimateMarkCompactTimeInitial) {
 
 TEST(GCIdleTimeHandler, EstimateMarkCompactTimeNonZero) {
   size_t size = 100 * MB;
-  size_t speed = 10 * KB;
+  size_t speed = 1 * MB;
   size_t time = GCIdleTimeHandler::EstimateMarkCompactTime(size, speed);
   EXPECT_EQ(size / speed, time);
 }