Add rappor metrics to track Media Session API usage

third_party/WebKit/Source/modules/mediasession/MediaSession.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/mediasession/MediaSession.h"
 
 #include "bindings/modules/v8/MediaSessionActionHandler.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentUserGestureToken.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/frame/LocalFrame.h"
 #include "modules/mediasession/MediaMetadata.h"
 #include "modules/mediasession/MediaMetadataSanitizer.h"
 #include "platform/UserGestureIndicator.h"
 #include "public/platform/InterfaceProvider.h"
+#include "public/platform/Platform.h"
 #include "wtf/Optional.h"
 #include <memory>
 
 namespace blink {
 
 namespace {
 
 using ::blink::mojom::blink::MediaSessionAction;
 
 const AtomicString& mojomActionToActionName(MediaSessionAction action) {
@@ skipping 172 matching lines @@
       << "MediaSession::getService() is only available from a frame";
   Document* document = toDocument(getExecutionContext());
   if (!document->frame())
     return nullptr;
 
   InterfaceProvider* interfaceProvider = document->frame()->interfaceProvider();
   if (!interfaceProvider)
     return nullptr;
 
   interfaceProvider->getInterface(mojo::MakeRequest(&m_service));
-  if (m_service.get())
+  if (m_service.get()) {
+    // Record the eTLD+1 of the frame using the API.
+    Platform::current()->recordRapporURL("Media.Session.APIUsage.Origin",
+                                         document->url());
     m_service->SetClient(m_clientBinding.CreateInterfacePtrAndBind());
+  }
 
   return m_service.get();
 }
 
 void MediaSession::DidReceiveAction(
     blink::mojom::blink::MediaSessionAction action) {
   DCHECK(getExecutionContext()->isDocument());
   Document* document = toDocument(getExecutionContext());
   UserGestureIndicator gestureIndicator(
       DocumentUserGestureToken::create(document));
@@ skipping 17 matching lines @@
   visitor->trace(m_actionHandlers);
   ContextClient::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(MediaSession) {
   for (auto handler : m_actionHandlers.values())
     visitor->traceWrappers(handler);
 }
 
 }  // namespace blink