[tracing] Support background mode in skia memory dump provider

skia/ext/skia_memory_dump_provider.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "skia_memory_dump_provider.h"
 
 #include "base/trace_event/memory_allocator_dump.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/process_memory_dump.h"
 #include "skia/ext/skia_trace_memory_dump_impl.h"
 #include "third_party/skia/include/core/SkGraphics.h"
 
 namespace skia {
 
 // static
 SkiaMemoryDumpProvider* SkiaMemoryDumpProvider::GetInstance() {
   return base::Singleton<
       SkiaMemoryDumpProvider,
       base::LeakySingletonTraits<SkiaMemoryDumpProvider>>::get();
 }
 
 SkiaMemoryDumpProvider::SkiaMemoryDumpProvider() {}
 
 SkiaMemoryDumpProvider::~SkiaMemoryDumpProvider() {}
 
 bool SkiaMemoryDumpProvider::OnMemoryDump(
     const base::trace_event::MemoryDumpArgs& args,
     base::trace_event::ProcessMemoryDump* process_memory_dump) {
+  if (args.level_of_detail ==
+      base::trace_event::MemoryDumpLevelOfDetail::BACKGROUND) {
+    auto glyph_cache_dump =
+        process_memory_dump->CreateAllocatorDump("skia/sk_glyph_cache");
+    glyph_cache_dump->AddScalar(
+        base::trace_event::MemoryAllocatorDump::kNameSize,
+        base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+        SkGraphics::GetFontCacheUsed());
+    auto resource_cache_dump =
+        process_memory_dump->CreateAllocatorDump("skia/sk_resource_cache");
+    resource_cache_dump->AddScalar(
+        base::trace_event::MemoryAllocatorDump::kNameSize,
+        base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+        SkGraphics::GetResourceCacheTotalBytesUsed());
+    return true;
+  }
   SkiaTraceMemoryDumpImpl skia_dumper(args.level_of_detail,
                                       process_memory_dump);
   SkGraphics::DumpMemoryStatistics(&skia_dumper);
 
   return true;
 }
 
 }  // namespace skia