Collect host of Web Component usage to send to RAPPOR

Source/core/frame/UseByOriginCounter.h

Index: Source/core/frame/UseByOriginCounter.h
diff --git a/Source/platform/network/ContentSecurityPolicyResponseHeaders.h b/Source/core/frame/UseByOriginCounter.h
similarity index 60%
copy from Source/platform/network/ContentSecurityPolicyResponseHeaders.h
copy to Source/core/frame/UseByOriginCounter.h
index 2ffe7c1a1787d2ebee8d7d1d38d39352a546ccb3..ae959262c2c90f96bab250152a2b8b56364cf439 100644
--- a/Source/platform/network/ContentSecurityPolicyResponseHeaders.h
+++ b/Source/core/frame/UseByOriginCounter.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013 Google, Inc. All rights reserved.
+ * Copyright (C) 2015 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -23,29 +23,50 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef ContentSecurityPolicyResponseHeaders_h
-#define ContentSecurityPolicyResponseHeaders_h
+#ifndef UseByOriginCounter_h
+#define UseByOriginCounter_h
 
-#include "platform/PlatformExport.h"
+#include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class ResourceResponse;
+class Document;
+class ScriptState;
 
-class PLATFORM_EXPORT ContentSecurityPolicyResponseHeaders {
+class UseByOriginCounter {
 public:
-    ContentSecurityPolicyResponseHeaders() { }
-    explicit ContentSecurityPolicyResponseHeaders(const ResourceResponse&);
+    enum class Feature {
+        ElementCreateShadowRoot,
+        DocumentRegisterElement,
 
-    const String& contentSecurityPolicy() const { return m_contentSecurityPolicy; }
-    const String& contentSecurityPolicyReportOnly() const { return m_contentSecurityPolicyReportOnly; }
+        NumberOfFeatures
+    };
+
+    class Value {
+    public:
+        Value();
+
+        bool isEmpty() const { return !m_countBits; }
+        void clear() { m_countBits = 0; }
+
+        void count(Feature);
+
+        void aggregate(Value);
+
+    private:
+        unsigned m_countBits : (unsigned)Feature::NumberOfFeatures;
+    };
+
+    static void count(const ScriptState*, Document&, Feature);
+
+    void documentDetached(Document&);
+    void updateMeasurementsAndClear();
 
 private:
-    String m_contentSecurityPolicy;
-    String m_contentSecurityPolicyReportOnly;
+    Vector<std::pair<String, UseByOriginCounter::Value>, 1> m_originAndValues;
 };
 
-}
+} // namespace blink
 
-#endif
+#endif // UseByOriginCounter_h