Refactor the Heap into ThreadHeap to prepare for per thread heaps

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

Index: third_party/WebKit/Source/platform/heap/PagePool.cpp
diff --git a/third_party/WebKit/Source/platform/heap/PagePool.cpp b/third_party/WebKit/Source/platform/heap/PagePool.cpp
index 9bda5c0d1eb8983ef3ff5e744cb9a90547385e20..c7128b57673136a181f414cbb7a9368f33ec8150 100644
--- a/third_party/WebKit/Source/platform/heap/PagePool.cpp
+++ b/third_party/WebKit/Source/platform/heap/PagePool.cpp
@@ -80,8 +80,7 @@ void OrphanedPagePool::decommitOrphanedPages()
 
 #if ENABLE(ASSERT)
     // No locking needed as all threads are at safepoints at this point in time.
-    for (ThreadState* state : ThreadState::attachedThreads())
-        ASSERT(state->isAtSafePoint());
+    ASSERT(ThreadState::mainThreadState()->gcGroup()->isParked());

[haraken, 2016/01/28 15:52:50]

isParked => isAtSafePoint

Note that "safe point" != "parked". A thread may be running a sync file
operation at a safe point. The thread is not parked in that case.

[keishi, 2016/02/29 06:02:33]

Done.

 #endif
 
     for (int index = 0; index < BlinkGC::NumberOfHeaps; ++index) {
@@ -101,7 +100,7 @@ void OrphanedPagePool::decommitOrphanedPages()
             } else {
                 page->~BasePage();
                 clearMemory(memory);
-                Heap::freePagePool()->addFreePage(index, memory);
+                ThreadState::current()->gcGroup()->freePagePool()->addFreePage(index, memory);
             }
 
             PoolEntry* deadEntry = entry;