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

gpu/command_buffer/client/mapped_memory.cc

 // Copyright (c) 2011 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 "gpu/command_buffer/client/mapped_memory.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "base/atomic_sequence_num.h"
@@ skipping 29 matching lines @@
       helper_(helper),
       allocated_memory_(0),
       max_free_bytes_(unused_memory_reclaim_limit),
       max_allocated_bytes_(kNoLimit),
       tracing_id_(g_next_mapped_memory_manager_tracing_id.GetNext()) {
   // In certain cases, ThreadTaskRunnerHandle isn't set (Android Webview).
   // Don't register a dump provider in these cases.
   // TODO(ericrk): Get this working in Android Webview. crbug.com/517156
   if (base::ThreadTaskRunnerHandle::IsSet()) {
     base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
-        this, base::ThreadTaskRunnerHandle::Get());
+        this, "gpu::MappedMemoryManager", base::ThreadTaskRunnerHandle::Get());
   }
 }
 
 MappedMemoryManager::~MappedMemoryManager() {
   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
       this);
 
   CommandBuffer* cmd_buf = helper_->command_buffer();
   for (MemoryChunkVector::iterator iter = chunks_.begin();
        iter != chunks_.end(); ++iter) {
@@ skipping 151 matching lines @@
 void ScopedMappedMemoryPtr::Reset(uint32_t new_size) {
   Release();
 
   if (new_size) {
     buffer_ = mapped_memory_manager_->Alloc(new_size, &shm_id_, &shm_offset_);
     size_ = buffer_ ? new_size : 0;
   }
 }
 
 }  // namespace gpu