[tracing] Introduce MemoryDumpArgs to enable light and heavy dumps

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 "third_party/skia/include/core/SkGraphics.h"
 #include "third_party/skia/src/core/SkResourceCache.h"
 
 namespace skia {
 
 // static
 SkiaMemoryDumpProvider* SkiaMemoryDumpProvider::GetInstance() {
   return Singleton<SkiaMemoryDumpProvider,
                    LeakySingletonTraits<SkiaMemoryDumpProvider>>::get();
 }
 
 SkiaMemoryDumpProvider::SkiaMemoryDumpProvider() {}
 
 SkiaMemoryDumpProvider::~SkiaMemoryDumpProvider() {}
 
 bool SkiaMemoryDumpProvider::OnMemoryDump(
+    const base::trace_event::MemoryDumpArgs& args,
     base::trace_event::ProcessMemoryDump* process_memory_dump) {
   auto font_mad =
       process_memory_dump->CreateAllocatorDump("skia/sk_font_cache");
   font_mad->AddScalar("size", "bytes", SkGraphics::GetFontCacheUsed());
   font_mad->AddScalar("count", "objects", SkGraphics::GetFontCacheCountUsed());
 
   auto resource_mad =
       process_memory_dump->CreateAllocatorDump("skia/sk_resource_cache");
   resource_mad->AddScalar("size", "bytes",
                           SkResourceCache::GetTotalBytesUsed());
   // TODO(ssid): crbug.com/503168. Add sub-allocation edges from discardable or
   // malloc memory dumps to avoid double counting.
 
   return true;
 }
 
 }  // namespace skia