tracing: restructure to the components/tracing folder

components/tracing/child_memory_dump_manager_delegate_impl.cc

-// Copyright 2015 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 "components/tracing/child_memory_dump_manager_delegate_impl.h"
-
-#include "base/single_thread_task_runner.h"
-#include "build/build_config.h"
-#include "components/tracing/child_trace_message_filter.h"
-#include "components/tracing/process_metrics_memory_dump_provider.h"
-
-namespace tracing {
-
-namespace {
-void AbortDumpRequest(const base::trace_event::MemoryDumpRequestArgs& args,
-                      const base::trace_event::MemoryDumpCallback& callback) {
-  if (!callback.is_null())
-    callback.Run(args.dump_guid, false /* success */);
-}
-}  // namespace
-
-// static
-ChildMemoryDumpManagerDelegateImpl*
-ChildMemoryDumpManagerDelegateImpl::GetInstance() {
-  return base::Singleton<
-      ChildMemoryDumpManagerDelegateImpl,
-      base::LeakySingletonTraits<ChildMemoryDumpManagerDelegateImpl>>::get();
-}
-
-ChildMemoryDumpManagerDelegateImpl::ChildMemoryDumpManagerDelegateImpl()
-    : ctmf_(nullptr),
-      tracing_process_id_(
-          base::trace_event::MemoryDumpManager::kInvalidTracingProcessId) {
-}
-
-ChildMemoryDumpManagerDelegateImpl::~ChildMemoryDumpManagerDelegateImpl() {}
-
-void ChildMemoryDumpManagerDelegateImpl::SetChildTraceMessageFilter(
-    ChildTraceMessageFilter* ctmf) {
-  const auto& task_runner = ctmf ? (ctmf->ipc_task_runner()) : nullptr;
-  // Check that we are either registering the CTMF or tearing it down, but not
-  // replacing a valid instance with another one (should never happen).
-  DCHECK(!ctmf_ || (!ctmf && ctmf_task_runner_));
-  ctmf_ = ctmf;
-
-  {
-    base::AutoLock lock(lock_);
-    ctmf_task_runner_ = task_runner;
-  }
-
-  if (ctmf) {
-    base::trace_event::MemoryDumpManager::GetInstance()->Initialize(
-      this /* delegate */, false /* is_coordinator */);
-
-#if !defined(OS_LINUX) && !defined(OS_NACL)
-    // On linux the browser process takes care of dumping process metrics.
-    // The child process is not allowed to do so due to BPF sandbox.
-    tracing::ProcessMetricsMemoryDumpProvider::RegisterForProcess(
-        base::kNullProcessId);
-#endif
-  }
-}
-
-// Invoked in child processes by the MemoryDumpManager.
-void ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump(
-    const base::trace_event::MemoryDumpRequestArgs& args,
-    const base::trace_event::MemoryDumpCallback& callback) {
-  // RequestGlobalMemoryDump can be called on any thread, cannot access
-  // ctmf_task_runner_ as it could be racy.
-  scoped_refptr<base::SingleThreadTaskRunner> ctmf_task_runner;
-  {
-    base::AutoLock lock(lock_);
-    ctmf_task_runner = ctmf_task_runner_;
-  }
-
-  // Bail out if we receive a dump request from the manager before the
-  // ChildTraceMessageFilter has been initialized.
-  if (!ctmf_task_runner)
-    return AbortDumpRequest(args, callback);
-
-  // Make sure we access |ctmf_| only on the thread where it lives to avoid
-  // races on shutdown.
-  if (!ctmf_task_runner->BelongsToCurrentThread()) {
-    const bool did_post_task = ctmf_task_runner->PostTask(
-        FROM_HERE,
-        base::Bind(&ChildMemoryDumpManagerDelegateImpl::RequestGlobalMemoryDump,
-                   base::Unretained(this), args, callback));
-    if (!did_post_task)
-      return AbortDumpRequest(args, callback);
-    return;
-  }
-
-  // The ChildTraceMessageFilter could have been destroyed while hopping on the
-  // right thread. If this is the case, bail out.
-  if (!ctmf_)
-    return AbortDumpRequest(args, callback);
-
-  // Send the request up to the browser process' MessageDumpmanager.
-  ctmf_->SendGlobalMemoryDumpRequest(args, callback);
-}
-
-uint64_t ChildMemoryDumpManagerDelegateImpl::GetTracingProcessId() const {
-  return tracing_process_id_;
-}
-
-}  // namespace tracing