Add Web Resources usage to chrome://tracing.

third_party/WebKit/Source/core/fetch/Resource.h

Index: third_party/WebKit/Source/core/fetch/Resource.h
diff --git a/third_party/WebKit/Source/core/fetch/Resource.h b/third_party/WebKit/Source/core/fetch/Resource.h
index 28944d85bfa91e82b4444d540888a0a3f6c04317..5cfcf9d6264f2bf6a5352bbb91b6ab33840bc193 100644
--- a/third_party/WebKit/Source/core/fetch/Resource.h
+++ b/third_party/WebKit/Source/core/fetch/Resource.h
@@ -258,6 +258,8 @@ public:
     // Used by the MemoryCache to reduce the memory consumption of the entry.
     void prune();
 
+    virtual void onMemoryDump(WebProcessMemoryDump*) const;
+
     static const char* resourceTypeToString(Type, const FetchInitiatorInfo&);
 
 #ifdef ENABLE_RESOURCE_IS_DELETED_CHECK
@@ -341,6 +343,9 @@ protected:
     virtual bool isSafeToUnlock() const { return false; }
     virtual void destroyDecodedDataIfPossible() { }
 
+    // Returns the memory dump name used for tracing. See Resource::onmemoryDump.
+    String getMemoryDumpName() const;
+
     ResourceRequest m_resourceRequest;
     AtomicString m_accept;
     PersistentWillBeMember<ResourceLoader> m_loader;