PartitionAlloc: Count direct mapped pages as committed

Extend committed pages counting to direct mapped allocations as well. We
already did adjust the total committed pages size when reallocating a
direct mapped allocation to reflect the difference, but since we didn't do
any counting when initially mapping or when unmapping, this would just
result in accounting errors.

Review URL: https://codereview.chromium.org/649583004

git-svn-id: svn://svn.chromium.org/blink/trunk@184169 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/wtf/PartitionAlloc.cpp

@@ -565,6 +565,8 @@ static ALWAYS_INLINE void* partitionDirectMap(PartitionRootBase* root, int flags
     mapSize += kPageAllocationGranularityOffsetMask;
     mapSize &= kPageAllocationGranularityBaseMask;
 
+    root->totalSizeOfCommittedPages += size + kSystemPageSize;
+
     // TODO: we may want to let the operating system place these allocations
     // where it pleases. On 32-bit, this might limit address space
     // fragmentation and on 64-bit, this might have useful savings for TLB
@@ -618,6 +620,9 @@ static ALWAYS_INLINE void partitionDirectUnmap(PartitionPage* page)
     // page.
     unmapSize += kPartitionPageSize + kSystemPageSize;
 
+    PartitionRootBase* root = partitionPageToRoot(page);
+    root->totalSizeOfCommittedPages -= page->bucket->slotSize + kSystemPageSize;
+
     ASSERT(!(unmapSize & kPageAllocationGranularityOffsetMask));
 
     char* ptr = reinterpret_cast<char*>(partitionPageToPointer(page));