[tracing] Add support for skia caches to dump memory stats

src/core/SkResourceCache.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkChecksum.h"
 #include "SkMessageBus.h"
 #include "SkMipMap.h"
 #include "SkMutex.h"
 #include "SkPixelRef.h"
 #include "SkResourceCache.h"
+#include "SkTraceMemoryDump.h"
 
 #include <stddef.h>
 #include <stdlib.h>
 
 DECLARE_SKMESSAGEBUS_MESSAGE(SkResourceCache::PurgeSharedIDMessage)
 
 // This can be defined by the caller's build system
 //#define SK_USE_DISCARDABLE_SCALEDIMAGECACHE
 
 #ifndef SK_DISCARDABLEMEMORY_SCALEDIMAGECACHE_COUNT_LIMIT
@@ skipping 641 matching lines @@
 /////////////
 
 static void dump_visitor(const SkResourceCache::Rec& rec, void*) {
     SkDebugf("RC: %12s bytes %9lu  discardable %p\n",
              rec.getCategory(), rec.bytesUsed(), rec.diagnostic_only_getDiscardable());
 }
 
 void SkResourceCache::TestDumpMemoryStatistics() {
     VisitAll(dump_visitor, nullptr);
 }
+
+static void sk_trace_dump_visitor(const SkResourceCache::Rec& rec, void* context) {
+    SkTraceMemoryDump* dump = static_cast<SkTraceMemoryDump*>(context);
+    SkString dump_name = SkStringPrintf("skia/sk_resource_cache/%s_%p", rec.getCategory(), &rec);
+    SkDiscardableMemory* discardable = rec.diagnostic_only_getDiscardable();
+    if (discardable) {
+        dump->setDiscardableMemoryBacking(dump_name.c_str(), *discardable);
+    } else {
+        dump->dumpNumericValue(dump_name.c_str(), "size", "bytes", rec.bytesUsed());
+        dump->setMemoryBacking(dump_name.c_str(), "malloc", nullptr);
+    }
+}
+
+void SkResourceCache::DumpMemoryStatistics(SkTraceMemoryDump* dump) {
+    VisitAll(sk_trace_dump_visitor, dump);
+}