Add a UseCounter that measures the amount of memory used in PartitionAlloc

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 d778f563c9acb859cabeb06af6d37b514437b638..0a46f3cdb6bf18ffb464be83b15fbcbb6fbfd6ae 100644
--- a/Source/platform/testing/RunAllTests.cpp
+++ b/Source/platform/testing/RunAllTests.cpp
@@ -53,7 +53,7 @@ static void AlwaysZeroNumberSource(unsigned char* buf, size_t len)
 int main(int argc, char** argv)
 {
     WTF::setRandomSource(AlwaysZeroNumberSource);
-    WTF::initialize(CurrentTime, 0);
+    WTF::initialize(CurrentTime, nullptr, nullptr);
     WTF::initializeMainThread(0);
 
     blink::TestingPlatformSupport::Config platformConfig;