Enable heap compaction on all 'container' arenas.

third_party/WebKit/Source/platform/heap/HeapCompact.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/heap/HeapCompact.h"
 
 #include "platform/Histogram.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/heap/Heap.h"
 #include "platform/heap/SparseHeapBitmap.h"
@@ skipping 366 matching lines @@
     size_t arena_size = arena->ArenaSize();
     size_t free_list_size = arena->FreeListSize();
     total_arena_size += arena_size;
     total_free_list_size += free_list_size;
     LOG_HEAP_FREELIST("%d: [%zu, %zu], ", i, arena_size, free_list_size);
     // TODO: be more discriminating and consider arena
     // load factor, effectiveness of past compactions etc.
     if (!arena_size)
       continue;
     // Mark the arena as compactable.
-    compactable_arenas_ |= (0x1u << (BlinkGC::kVector1ArenaIndex + i));
+    compactable_arenas_ |= 0x1u << i;
   }
   LOG_HEAP_FREELIST("}\nTotal = %zu, Free = %zu\n", total_arena_size,
                     total_free_list_size);
 
   // TODO(sof): consider smoothing the reported sizes.
   free_list_size_ = total_free_list_size;
 }
 
 void HeapCompact::FinishedArenaCompaction(NormalPageArena* arena,
                                           size_t freed_pages,
@@ skipping 60 matching lines @@
   Fixups().AddCompactingPage(page);
 }
 
 bool HeapCompact::ScheduleCompactionGCForTesting(bool value) {
   bool current = force_compaction_gc_;
   force_compaction_gc_ = value;
   return current;
 }
 
 }  // namespace blink