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 4614d1fbaf77e4cbef8ab026d3a666769bdcf2ec..fb015e020dba408cb9de13d3b86891c94d798216 100644
--- a/third_party/WebKit/Source/core/fetch/Resource.h
+++ b/third_party/WebKit/Source/core/fetch/Resource.h
@@ -260,6 +260,8 @@ 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
@@ -343,6 +345,9 @@ 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;