Implement a fast buffer allocator for Vector, HashTable and StringBuilder

Source/web/WebKit.cpp

Index: Source/web/WebKit.cpp
diff --git a/Source/web/WebKit.cpp b/Source/web/WebKit.cpp
index 5e9638c9433ed6b48d9ca8ca44b156bcd88f6969..e1c3b2dbc368db811c25fa7e647c9c1540f202bc 100644
--- a/Source/web/WebKit.cpp
+++ b/Source/web/WebKit.cpp
@@ -172,6 +172,28 @@ void initializeWithoutV8(Platform* platform)
     ASSERT(platform);
     Platform::initialize(platform);
 
+    blink::BufferAllocator::initialize();
+    DefaultAllocator::initialize(blink::BufferAllocator::quantizedSize
+        , blink::BufferAllocator::allocateVectorBacking
+        , blink::BufferAllocator::allocateExpandedVectorBacking
+        , blink::BufferAllocator::freeVectorBacking
+        , blink::BufferAllocator::expandVectorBacking
+        , blink::BufferAllocator::shrinkVectorBacking
+        , blink::BufferAllocator::allocateInlineVectorBacking
+        , blink::BufferAllocator::freeInlineVectorBacking
+        , blink::BufferAllocator::expandInlineVectorBacking
+        , blink::BufferAllocator::shrinkInlineVectorBacking
+        , blink::BufferAllocator::allocateHashTableBacking
+        , blink::BufferAllocator::allocateZeroedHashTableBacking
+        , blink::BufferAllocator::allocateExpandedHashTableBacking
+        , blink::BufferAllocator::allocateZeroedExpandedHashTableBacking
+        , blink::BufferAllocator::freeHashTableBacking
+        , blink::BufferAllocator::expandHashTableBacking
+        , blink::BufferAllocator::allocateBufferStringBacking
+        , blink::BufferAllocator::freeBufferStringBacking
+        , blink::BufferAllocator::expandBufferStringBacking
+        , blink::BufferAllocator::shrinkBufferStringBacking);
+
     WTF::setRandomSource(cryptographicallyRandomValues);
     WTF::initialize(currentTimeFunction, monotonicallyIncreasingTimeFunction, systemTraceTimeFunction, histogramEnumerationFunction, adjustAmountOfExternalAllocatedMemory);
     WTF::initializeMainThread(callOnMainThreadFunction);
@@ -241,6 +263,7 @@ void shutdownWithoutV8()
     CoreInitializer::shutdown();
     Heap::shutdown();
     WTF::shutdown();
+    blink::BufferAllocator::shutdown();
     Platform::shutdown();
     WebPrerenderingSupport::shutdown();
 }