Correctly initialize MemoryDumpArgs in the MojoHandleTable test.

mojo/edk/system/handle_table_unittest.cc

 // Copyright 2017 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 "mojo/edk/system/handle_table.h"
 
 #include <memory>
 
 #include "base/synchronization/lock.h"
 #include "base/trace_event/memory_allocator_dump.h"
@@ skipping 46 matching lines @@
 TEST(HandleTableTest, OnMemoryDump) {
   HandleTable ht;
 
   {
     base::AutoLock auto_lock(ht.GetLock());
     scoped_refptr<mojo::edk::Dispatcher> dispatcher(
         new FakeMessagePipeDispatcher);
     ht.AddDispatcher(dispatcher);
   }
 
-  base::trace_event::MemoryDumpArgs args;
+  base::trace_event::MemoryDumpArgs args = {
+      base::trace_event::MemoryDumpLevelOfDetail::DETAILED};
   base::trace_event::ProcessMemoryDump pmd(nullptr, args);
   ht.OnMemoryDump(args, &pmd);
 
   CheckNameAndValue(&pmd, "mojo/message_pipe", "1");
   CheckNameAndValue(&pmd, "mojo/data_pipe_consumer", "0");
 }
 
 }  // namespace edk
 }  // namespace mojo