tracing: Report ResourceClients and the reason for not deletable for web-caches

third_party/WebKit/Source/core/fetch/RawResourceTest.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 71 matching lines @@
     EXPECT_EQ(memoryCache()->resourceForURL(KURL(ParsedURLString, "data:text/html,")), resource.get());
     memoryCache()->remove(resource.get());
 }
 
 class DummyClient : public RawResourceClient {
 public:
     DummyClient() : m_called(false) {}
     ~DummyClient() override {}
 
     // ResourceClient implementation.
-    virtual void notifyFinished(Resource* resource)
+    void notifyFinished(Resource* resource) override
     {
         m_called = true;
     }
+    String debugName() const override { return "DummyClient"; }
 
     bool called() { return m_called; }
 private:
     bool m_called;
 };
 
 // This client adds another client when notified.
 class AddingClient : public RawResourceClient {
 public:
     AddingClient(DummyClient* client, Resource* resource)
         : m_dummyClient(client)
         , m_resource(resource)
         , m_removeClientTimer(this, &AddingClient::removeClient) {}
 
     ~AddingClient() override {}
 
     // ResourceClient implementation.
-    virtual void notifyFinished(Resource* resource)
+    void notifyFinished(Resource* resource) override
     {
         // First schedule an asynchronous task to remove the client.
         // We do not expect the client to be called.
         m_removeClientTimer.startOneShot(0, BLINK_FROM_HERE);
         resource->addClient(m_dummyClient);
     }
+    String debugName() const override { return "AddingClient"; }
+
     void removeClient(Timer<AddingClient>* timer)
     {
         m_resource->removeClient(m_dummyClient);
     }
 private:
     DummyClient* m_dummyClient;
     ResourcePtr<Resource> m_resource;
     Timer<AddingClient> m_removeClientTimer;
 };
 
@@ skipping 19 matching lines @@
 
 // This client removes another client when notified.
 class RemovingClient : public RawResourceClient {
 public:
     RemovingClient(DummyClient* client)
         : m_dummyClient(client) {}
 
     ~RemovingClient() override {}
 
     // ResourceClient implementation.
-    virtual void notifyFinished(Resource* resource)
+    void notifyFinished(Resource* resource) override
     {
         resource->removeClient(m_dummyClient);
         resource->removeClient(this);
     }
+    String debugName() const override { return "RemovingClient"; }
 private:
     DummyClient* m_dummyClient;
 };
 
 TEST(RawResourceTest, RemoveClientDuringCallback)
 {
     ResourcePtr<Resource> raw = new RawResource(ResourceRequest("data:text/html,"), Resource::Raw);
     raw->setLoading(false);
 
     // Create a non-null response.
     ResourceResponse response = raw->response();
     response.setURL(KURL(ParsedURLString, "http://600.613/"));
     raw->setResponse(response);
     EXPECT_FALSE(raw->response().isNull());
 
     OwnPtr<DummyClient> dummyClient = adoptPtr(new DummyClient());
     OwnPtr<RemovingClient> removingClient = adoptPtr(new RemovingClient(dummyClient.get()));
     raw->addClient(dummyClient.get());
     raw->addClient(removingClient.get());
     testing::runPendingTasks();
     EXPECT_FALSE(raw->hasClients());
 }
 
 } // namespace blink