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

Source/wtf/testing/RunAllTests.cpp

Index: Source/wtf/testing/RunAllTests.cpp
diff --git a/Source/wtf/testing/RunAllTests.cpp b/Source/wtf/testing/RunAllTests.cpp
index 5d27780e99d586068c6249d6eff297fda1cbd7d9..7703fe9c9607cdfa1b6079c63255bc393a10920f 100644
--- a/Source/wtf/testing/RunAllTests.cpp
+++ b/Source/wtf/testing/RunAllTests.cpp
@@ -49,7 +49,7 @@ 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);
     return base::RunUnitTestsUsingBaseTestSuite(argc, argv);
 }