Implement a fast buffer allocator for Vector, HashTable and StringBuilder

Source/platform/testing/RunAllTests.cpp

Index: Source/platform/testing/RunAllTests.cpp
diff --git a/Source/platform/testing/RunAllTests.cpp b/Source/platform/testing/RunAllTests.cpp
index d63549b2954f32c12b87e8dffb6d39cf23cd761b..75d8fd407ede04ba27210ce7a1d9bc5574467413 100644
--- a/Source/platform/testing/RunAllTests.cpp
+++ b/Source/platform/testing/RunAllTests.cpp
@@ -52,6 +52,28 @@ static void AlwaysZeroNumberSource(unsigned char* buf, size_t len)
 
 int main(int argc, char** argv)
 {
+    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(AlwaysZeroNumberSource);
     WTF::initialize(CurrentTime, nullptr, nullptr, nullptr, nullptr);
     WTF::initializeMainThread(0);