Implement progress bar for large objects.

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 583b2ca5124982cda6302c4b6b62213b34c2752a..0ac23d279db6d5c13e3d9b0b67206cdd7f983ce0 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -448,6 +448,7 @@ MemoryChunk* MemoryChunk::Initialize(Heap* heap,
   chunk->slots_buffer_ = NULL;
   chunk->skip_list_ = NULL;
   chunk->write_barrier_counter_ = kWriteBarrierCounterGranularity;
+  chunk->progress_bar_ = 0;
   chunk->high_water_mark_ = static_cast<int>(area_start - base);
   chunk->ResetLiveBytes();
   Bitmap::Clear(chunk);
@@ -2784,7 +2785,8 @@ void LargeObjectSpace::FreeUnmarkedObjects() {
     MarkBit mark_bit = Marking::MarkBitFrom(object);
     if (mark_bit.Get()) {
       mark_bit.Clear();
-      MemoryChunk::IncrementLiveBytesFromGC(object->address(), -object->Size());
+      Page::FromAddress(object->address())->ResetProgressBar();
+      Page::FromAddress(object->address())->ResetLiveBytes();
       previous = current;
       current = current->next_page();
     } else {