[tracing] Introduce MemoryDumpArgs to enable light and heavy dumps

skia/ext/skia_memory_dump_provider_unittest.cc

Index: skia/ext/skia_memory_dump_provider_unittest.cc
diff --git a/skia/ext/skia_memory_dump_provider_unittest.cc b/skia/ext/skia_memory_dump_provider_unittest.cc
index bea4a8b1fc9e86112da0ae8f70544a23b261ddac..2ee869e51a62647db48a270cfbed5e13fc1e2fc7 100644
--- a/skia/ext/skia_memory_dump_provider_unittest.cc
+++ b/skia/ext/skia_memory_dump_provider_unittest.cc
@@ -12,6 +12,8 @@ TEST(SkiaMemoryDumpProviderTest, OnMemoryDump) {
   scoped_ptr<base::trace_event::ProcessMemoryDump> process_memory_dump(
       new base::trace_event::ProcessMemoryDump(nullptr));
   SkiaMemoryDumpProvider::GetInstance()->OnMemoryDump(
+      base::trace_event::MemoryDumpArgs(
+          base::trace_event::MemoryDumpArgs::LEVEL_OF_DETAIL_HIGH),
       process_memory_dump.get());
 
   ASSERT_TRUE(process_memory_dump->GetAllocatorDump("skia/sk_font_cache"));