Split ProxyResolverV8Tracing into an implementation and a wrapper.

net/proxy/load_state_change_coalescer.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 "net/proxy/load_state_change_coalescer.h"
-
-namespace net {
-
-LoadStateChangeCoalescer::LoadStateChangeCoalescer(
-    const base::Callback<void(LoadState)>& callback,
-    const base::TimeDelta& timeout,
-    LoadState initial_load_state)
-    : callback_(callback),
-      timeout_(timeout),
-      committed_load_state_(initial_load_state),
-      pending_load_state_(initial_load_state) {
-}
-
-void LoadStateChangeCoalescer::LoadStateChanged(LoadState load_state) {
-  if (load_state == committed_load_state_) {
-    timer_.Stop();
-    return;
-  }
-  pending_load_state_ = load_state;
-  timer_.Start(FROM_HERE, timeout_, this,
-               &LoadStateChangeCoalescer::SendLoadStateChanged);
-}
-
-LoadStateChangeCoalescer::~LoadStateChangeCoalescer() = default;
-
-void LoadStateChangeCoalescer::SendLoadStateChanged() {
-  committed_load_state_ = pending_load_state_;
-  callback_.Run(pending_load_state_);
-}
-
-}  // namespace net