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

Source/web/WebKit.cpp

Index: Source/web/WebKit.cpp
diff --git a/Source/web/WebKit.cpp b/Source/web/WebKit.cpp
index 543e34b2bfd25b726021c5eb8e7bb9069fe05e03..a7826f1701b337b009058946526f1d82ffacf1d9 100644
--- a/Source/web/WebKit.cpp
+++ b/Source/web/WebKit.cpp
@@ -143,6 +143,11 @@ static double monotonicallyIncreasingTimeFunction()
     return Platform::current()->monotonicallyIncreasingTime();
 }
 
+static void histogramEnumerationFunction(const char* name, int sample, int boundaryValue)
+{
+    Platform::current()->histogramEnumeration(name, sample, boundaryValue);
+}
+
 static void cryptographicallyRandomValues(unsigned char* buffer, size_t length)
 {
     Platform::current()->cryptographicallyRandomValues(buffer, length);
@@ -162,7 +167,7 @@ void initializeWithoutV8(Platform* platform)
     Platform::initialize(platform);
 
     WTF::setRandomSource(cryptographicallyRandomValues);
-    WTF::initialize(currentTimeFunction, monotonicallyIncreasingTimeFunction);
+    WTF::initialize(currentTimeFunction, monotonicallyIncreasingTimeFunction, histogramEnumerationFunction);
     WTF::initializeMainThread(callOnMainThreadFunction);
     Heap::init();