Add Web Resources usage to chrome://tracing.

third_party/WebKit/Source/core/fetch/MemoryCache.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
     version 2 of the License, or (at your option) any later version.
@@ skipping 87 matching lines @@
     , m_minDeadCapacity(0)
     , m_maxDeadCapacity(cDefaultCacheCapacity)
     , m_maxDeferredPruneDeadCapacity(cDeferredPruneDeadCapacityFactor * cDefaultCacheCapacity)
     , m_delayBeforeLiveDecodedPrune(cMinDelayBeforeLiveDecodedPrune)
     , m_liveSize(0)
     , m_deadSize(0)
 #ifdef MEMORY_CACHE_STATS
     , m_statsTimer(this, &MemoryCache::dumpStats)
 #endif
 {
+    Platform::current()->registerMemoryDumpProvider(this);
 #ifdef MEMORY_CACHE_STATS
     const double statsIntervalInSeconds = 15;
     m_statsTimer.startRepeating(statsIntervalInSeconds, FROM_HERE);
 #endif
 }
 
 MemoryCache* MemoryCache::create()
 {
     return new MemoryCache;
 }
 
 MemoryCache::~MemoryCache()
 {
+    Platform::current()->unregisterMemoryDumpProvider(this);
     if (m_prunePending)
         Platform::current()->currentThread()->removeTaskObserver(this);
 }
 
 DEFINE_TRACE(MemoryCache)
 {
     visitor->trace(m_allResources);
     for (size_t i = 0; i < WTF_ARRAY_LENGTH(m_liveDecodedResources); ++i)
         visitor->trace(m_liveDecodedResources[i]);
     visitor->trace(m_resourceMaps);
@@ skipping 642 matching lines @@
     pruneLiveResources(strategy);
     m_pruneFrameTimeStamp = m_lastFramePaintTimeStamp;
     m_pruneTimeStamp = currentTime;
 }
 
 void MemoryCache::updateFramePaintTimestamp()
 {
     m_lastFramePaintTimeStamp = currentTime();
 }
 
+bool MemoryCache::onMemoryDump(WebMemoryDumpLevelOfDetail levelOfDetail, WebProcessMemoryDump* memoryDump)
+{
+    for (const auto& resourceMapIter : m_resourceMaps) {
+        for (const auto& resourceIter : *resourceMapIter.value) {
+            Resource* resource = resourceIter.value->m_resource.get();
+            resource->onMemoryDump(memoryDump);
+        }
+    }
+    return true;
+}
+
 void MemoryCache::registerLiveResource(Resource& resource)
 {
 #if ENABLE(OILPAN)
     ASSERT(!m_liveResources.contains(&resource));
     m_liveResources.add(&resource);
 #endif
 }
 
 void MemoryCache::unregisterLiveResource(Resource& resource)
 {
@@ skipping 41 matching lines @@
                 printf("(%.1fK, %.1fK, %uA, %dR, %d, %d); ", currentResource->decodedSize() / 1024.0f, (currentResource->encodedSize() + currentResource->overheadSize()) / 1024.0f, current->m_accessCount, currentResource->hasClients(), currentResource->isPurgeable(), currentResource->wasPurged());
 
             current = current->m_previousInAllResourcesList;
         }
     }
 }
 
 #endif // MEMORY_CACHE_STATS
 
 } // namespace blink