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

include/core/SkGraphics.h

Index: include/core/SkGraphics.h
diff --git a/include/core/SkGraphics.h b/include/core/SkGraphics.h
index 8d804b37053257760e9de2c3d7a1c0853df8ac58..8e8bd77ef4545048bb3114cb5bf82d3334cdb3f2 100644
--- a/include/core/SkGraphics.h
+++ b/include/core/SkGraphics.h
@@ -12,6 +12,7 @@
 
 class SkData;
 class SkImageGenerator;
+class SkTraceMemoryDump;
 
 class SK_API SkGraphics {
 public:
@@ -115,6 +116,12 @@ public:
     static size_t SetResourceCacheSingleAllocationByteLimit(size_t newLimit);
 
     /**
+     *  Dumps memory usage of caches using the SkTraceMemoryDump interface. See SkTraceMemoryDump
+     *  for usage of this method.
+     */
+    static void DumpMemoryStatistics(SkTraceMemoryDump* dump);
+
+    /**
      *  Applications with command line options may pass optional state, such
      *  as cache sizes, here, for instance:
      *  font-cache-limit=12345678