Add use-counters for Client-Hints features

Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 204 matching lines @@
 
 void FrameFetchContext::dispatchDidLoadResourceFromMemoryCache(const ResourceRequest& request, const ResourceResponse& response)
 {
     frame()->loader().client()->dispatchDidLoadResourceFromMemoryCache(request, response);
 }
 
 void FrameFetchContext::dispatchDidReceiveResponse(unsigned long identifier, const ResourceResponse& response, ResourceLoader* resourceLoader)
 {
     MixedContentChecker::checkMixedPrivatePublic(frame(), response.remoteIPAddress());
     LinkLoader::loadLinkFromHeader(response.httpHeaderField("Link"), frame()->document());
-    if (m_documentLoader == frame()->loader().provisionalDocumentLoader())
-        handleAcceptClientHintsHeader(response.httpHeaderField("accept-ch"), m_documentLoader->clientHintsPreferences());
+    if (m_documentLoader == frame()->loader().provisionalDocumentLoader()) {
+        ResourceFetcher* fetcher = nullptr;
+        if (frame()->document())
+            fetcher = frame()->document()->fetcher();
+        handleAcceptClientHintsHeader(response.httpHeaderField("accept-ch"), m_documentLoader->clientHintsPreferences(), fetcher);
+    }
 
     frame()->loader().progress().incrementProgress(identifier, response);
     frame()->loader().client()->dispatchDidReceiveResponse(m_documentLoader, identifier, response);
     TRACE_EVENT_INSTANT1("devtools.timeline", "ResourceReceiveResponse", TRACE_EVENT_SCOPE_THREAD, "data", InspectorReceiveResponseEvent::data(identifier, frame(), response));
     DocumentLoader* documentLoader = ensureLoaderForNotifications();
     InspectorInstrumentation::didReceiveResourceResponse(frame(), identifier, documentLoader, response, resourceLoader);
     // It is essential that inspector gets resource response BEFORE console.
     frame()->console().reportResourceResponseReceived(documentLoader, identifier, response);
 }
 
@@ skipping 393 matching lines @@
 void FrameFetchContext::addCSPHeaderIfNecessary(Resource::Type type, FetchRequest& fetchRequest)
 {
     if (!m_document)
         return;
 
     const ContentSecurityPolicy* csp = m_document->contentSecurityPolicy();
     if (csp->shouldSendCSPHeader(type))
         fetchRequest.mutableResourceRequest().addHTTPHeaderField("CSP", "active");
 }
 
+void FrameFetchContext::countClientHintsDPR()
+{
+    UseCounter::count(frame(), UseCounter::ClientHintsDPR);
+}
+
+void FrameFetchContext::countClientHintsResourceWidth()
+{
+    UseCounter::count(frame(), UseCounter::ClientHintsResourceWidth);
+}
+
+void FrameFetchContext::countClientHintsViewportWidth()
+{
+    UseCounter::count(frame(), UseCounter::ClientHintsViewportWidth);
+}
+
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink