Collect host of Web Component usage to send to RAPPOR

Source/core/frame/UseCounter.cpp

Index: Source/core/frame/UseCounter.cpp
diff --git a/Source/core/frame/UseCounter.cpp b/Source/core/frame/UseCounter.cpp
index 79739c5e09d9124ebe166b3ffd87de8b88088e4b..46ae275394668b883a6fb82d99d7a8f420d4c605 100644
--- a/Source/core/frame/UseCounter.cpp
+++ b/Source/core/frame/UseCounter.cpp
@@ -34,6 +34,7 @@
 #include "core/frame/FrameConsole.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/UseByOriginCounter.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "public/platform/Platform.h"
@@ -575,6 +576,8 @@ void UseCounter::updateMeasurements()
         blink::Platform::current()->histogramEnumeration("WebCore.FeatureObserver.CSSProperties", totalPagesMeasuredCSSSampleId(), maximumCSSSampleId());
 
     m_CSSFeatureBits.clearAll();
+
+    m_useByOriginCounter.updateMeasurementsAndClear();
 }
 
 void UseCounter::didCommitLoad()