Collect host of Web Component usage to send to RAPPOR

Source/core/frame/UseByOriginCounter.h

 /*
- * 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
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * 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