PlzNavigate: AppCache support.

content/browser/appcache/appcache_navigation_handle.cc

+// Copyright 2016 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/browser/appcache/appcache_navigation_handle.h"
+
+#include "base/bind.h"
+#include "content/browser/appcache/appcache_navigation_handle_core.h"
+#include "content/browser/appcache/chrome_appcache_service.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/common/appcache_info.h"
+
+namespace {
+// PlzNavigate: Used to generate the host id for a navigation initiated by the
+// browser. Starts at -2 and keeps going down.
+static int g_next_appcache_host_id = -1;
+}
+
+namespace content {
+
+AppCacheNavigationHandle::AppCacheNavigationHandle(
+    ChromeAppCacheService* appcache_service)
+    : appcache_host_id_(kAppCacheNoHostId),
+      core_(nullptr),
+      weak_factory_(this) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  appcache_host_id_ = g_next_appcache_host_id--;
+  core_.reset(new AppCacheNavigationHandleCore(
+      weak_factory_.GetWeakPtr(), appcache_service, appcache_host_id_));
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                          base::Bind(&AppCacheNavigationHandleCore::Initialize,
+                                     base::Unretained(core_.get())));
+}
+
+AppCacheNavigationHandle::~AppCacheNavigationHandle() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  // Delete the AppCacheNavigationHandleCore on the IO thread.
+  BrowserThread::DeleteSoon(BrowserThread::IO, FROM_HERE, core_.release());
+}
+
+}  // namespace content