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

Dump the memory statistics of resource cache and glyph cache using the
SkTraceMemoryDump interface.

BUG=chromium:503168

Review URL: https://codereview.chromium.org/1313793004

1 files changed, 17 insertions, 0 deletions

diff --git a/src/core/SkResourceCache.cpp b/src/core/SkResourceCache.cpp
index 4d2453c71e..7d3c3420db 100644
--- a/src/core/SkResourceCache.cpp
+++ b/src/core/SkResourceCache.cpp
@@ -11,6 +11,7 @@
 #include "SkMutex.h"
 #include "SkPixelRef.h"
 #include "SkResourceCache.h"
+#include "SkTraceMemoryDump.h"
 
 #include <stddef.h>
 #include <stdlib.h>
@@ -669,3 +670,19 @@ static void dump_visitor(const SkResourceCache::Rec& rec, void*) {
 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);
+}