[tracing] Add names to memory-infra dumpers for debugging

content/child/child_discardable_shared_memory_manager.cc

 // Copyright 2014 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 "content/child/child_discardable_shared_memory_manager.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/debug/crash_logging.h"
 #include "base/memory/discardable_memory.h"
@@ skipping 69 matching lines @@
     DiscardableSharedMemoryId id) {
   sender->Send(new ChildProcessHostMsg_DeletedDiscardableSharedMemory(id));
 }
 
 }  // namespace
 
 ChildDiscardableSharedMemoryManager::ChildDiscardableSharedMemoryManager(
     ThreadSafeSender* sender)
     : heap_(base::GetPageSize()), sender_(sender) {
   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
-      this, base::ThreadTaskRunnerHandle::Get());
+      this, "ChildDiscardableSharedMemoryManager",
+      base::ThreadTaskRunnerHandle::Get());
 }
 
 ChildDiscardableSharedMemoryManager::~ChildDiscardableSharedMemoryManager() {
   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
       this);
   // TODO(reveman): Determine if this DCHECK can be enabled. crbug.com/430533
   // DCHECK_EQ(heap_.GetSize(), heap_.GetSizeOfFreeLists());
   if (heap_.GetSize())
     MemoryUsageChanged(0, 0);
 }
@@ skipping 209 matching lines @@
       "discardable-memory-allocated";
   base::debug::SetCrashKeyValue(kDiscardableMemoryAllocatedKey,
                                 base::Uint64ToString(new_bytes_total));
 
   static const char kDiscardableMemoryFreeKey[] = "discardable-memory-free";
   base::debug::SetCrashKeyValue(kDiscardableMemoryFreeKey,
                                 base::Uint64ToString(new_bytes_free));
 }
 
 }  // namespace content