Create a dedicated partition for array buffers

third_party/WebKit/Source/wtf/allocator/Partitions.cpp

Index: third_party/WebKit/Source/wtf/allocator/Partitions.cpp
diff --git a/third_party/WebKit/Source/wtf/allocator/Partitions.cpp b/third_party/WebKit/Source/wtf/allocator/Partitions.cpp
index 04602cf8131be2d3403ab2e28c340441adbb0f44..bcc4658ac475771cfa5b303fc6902768dd1a0238 100644
--- a/third_party/WebKit/Source/wtf/allocator/Partitions.cpp
+++ b/third_party/WebKit/Source/wtf/allocator/Partitions.cpp
@@ -43,6 +43,7 @@ base::subtle::SpinLock Partitions::s_initializationLock;
 bool Partitions::s_initialized = false;
 
 base::PartitionAllocatorGeneric Partitions::m_fastMallocAllocator;
+base::PartitionAllocatorGeneric Partitions::m_arrayBufferAllocator;
 base::PartitionAllocatorGeneric Partitions::m_bufferAllocator;
 base::SizeSpecificPartitionAllocator<1024> Partitions::m_layoutAllocator;
 Partitions::ReportPartitionAllocSizeFunction Partitions::m_reportSizeFunction =
@@ -55,6 +56,7 @@ void Partitions::initialize(
   if (!s_initialized) {
     base::PartitionAllocGlobalInit(&Partitions::handleOutOfMemory);
     m_fastMallocAllocator.init();
+    m_arrayBufferAllocator.init();
     m_bufferAllocator.init();
     m_layoutAllocator.init();
     m_reportSizeFunction = reportSizeFunction;
@@ -67,6 +69,8 @@ void Partitions::decommitFreeableMemory() {
   if (!s_initialized)
     return;
 
+  PartitionPurgeMemoryGeneric(arrayBufferPartition(),
+                              base::PartitionPurgeDecommitEmptyPages);
   PartitionPurgeMemoryGeneric(bufferPartition(),
                               base::PartitionPurgeDecommitEmptyPages);
   PartitionPurgeMemoryGeneric(fastMallocPartition(),
@@ -101,6 +105,8 @@ void Partitions::dumpMemoryStats(
   decommitFreeableMemory();
   PartitionDumpStatsGeneric(fastMallocPartition(), "fast_malloc", isLightDump,
                             partitionStatsDumper);
+  PartitionDumpStatsGeneric(arrayBufferPartition(), "array_buffer", isLightDump,
+                            partitionStatsDumper);
   PartitionDumpStatsGeneric(bufferPartition(), "buffer", isLightDump,
                             partitionStatsDumper);
   PartitionDumpStats(layoutPartition(), "layout", isLightDump,