[tracing] Introduce MemoryDumpArgs to enable light and heavy dumps

base/trace_event/trace_log.h

Index: base/trace_event/trace_log.h
diff --git a/base/trace_event/trace_log.h b/base/trace_event/trace_log.h
index a02094a9e9d3ad1651048e3218451f4de543a43e..510113ae11fa6c9887a1ed050b235d2f4091bb31 100644
--- a/base/trace_event/trace_log.h
+++ b/base/trace_event/trace_log.h
@@ -327,7 +327,8 @@ class BASE_EXPORT TraceLog : public MemoryDumpProvider {
   friend struct DefaultSingletonTraits<TraceLog>;
 
   // MemoryDumpProvider implementation.
-  bool OnMemoryDump(ProcessMemoryDump* pmd) override;
+  bool OnMemoryDump(const MemoryDumpArgs& args,
+                    ProcessMemoryDump* pmd) override;
 
   // Enable/disable each category group based on the current mode_,
   // category_filter_, event_callback_ and event_callback_category_filter_.