[tracing] Introduce MemoryDumpArgs to enable light and heavy dumps

content/child/child_discardable_shared_memory_manager.cc

Index: content/child/child_discardable_shared_memory_manager.cc
diff --git a/content/child/child_discardable_shared_memory_manager.cc b/content/child/child_discardable_shared_memory_manager.cc
index 5bdcef7337279443eb335df5bdde37cdbd926d88..ff8fe4357881edab5e704846945280c75da294a7 100644
--- a/content/child/child_discardable_shared_memory_manager.cc
+++ b/content/child/child_discardable_shared_memory_manager.cc
@@ -191,6 +191,7 @@ ChildDiscardableSharedMemoryManager::AllocateLockedDiscardableMemory(
 }
 
 bool ChildDiscardableSharedMemoryManager::OnMemoryDump(
+    const base::trace_event::MemoryDumpArgs& args,
     base::trace_event::ProcessMemoryDump* pmd) {
   base::AutoLock lock(lock_);
   return heap_.OnMemoryDump(pmd);