Added interstitial page for merge session.

chrome/browser/chromeos/login/merge_session_throttle.cc

+// Copyright (c) 2013 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 "chrome/browser/chromeos/login/merge_session_throttle.h"
+
+#include <vector>
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/memory/singleton.h"
+#include "base/metrics/histogram.h"
+#include "base/string_util.h"
+#include "chrome/browser/chromeos/login/login_utils.h"
+#include "chrome/browser/google/google_util.h"
+#include "chrome/browser/net/chrome_url_request_context.h"
+#include "chrome/common/url_constants.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/render_view_host.h"
+#include "content/public/browser/resource_controller.h"
+#include "content/public/browser/web_contents.h"
+#include "net/base/net_errors.h"
+#include "net/base/net_util.h"
+#include "net/base/network_change_notifier.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
+
+using content::BrowserThread;
+using content::RenderViewHost;
+using content::WebContents;
+
+namespace {
+
+void ShowDeleayedLoadingPage(
+    int render_process_id,
+    int render_view_id,
+    const GURL& url,
+    const chromeos::MergeSessionLoadPage::CompletionCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  // Check again on UI thread and proceed if it's connected.
+  if (chromeos::UserManager::Get()->GetMergeSessionState() !=
+          chromeos::UserManager::MERGE_STATUS_IN_PROCESS) {
+    BrowserThread::PostTask(
+        BrowserThread::IO, FROM_HERE, base::Bind(callback, true));
+  } else {
+    RenderViewHost* render_view_host =
+        RenderViewHost::FromID(render_process_id, render_view_id);
+    WebContents* web_contents = render_view_host ?
+        WebContents::FromRenderViewHost(render_view_host) : NULL;
+    // There is a chance that the tab closed after we decided to show
+    // the offline page on the IO thread and before we actually show the
+    // offline page here on the UI thread.
+    if (web_contents)
+      (new chromeos::MergeSessionLoadPage(web_contents, url, callback))->Show();
+  }
+}
+
+}  // namespace
+
+MergeSessionThrottle::MergeSessionThrottle(
+    int render_process_id,

[oshima, 2013/02/15 22:40:52]

nit: is it possible to align arguments to (?
I think it's more readable if they fit 80 chars.

[zel, 2013/02/15 23:16:58]

Done.

+    int render_view_id,
+    net::URLRequest* request)
+    : render_process_id_(render_process_id),
+      render_view_id_(render_view_id),
+      request_(request) {
+}
+
+MergeSessionThrottle::~MergeSessionThrottle() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+}
+
+void MergeSessionThrottle::WillStartRequest(bool* defer) {
+  if (!ShouldShowMergeSessionPage(request_->url()))
+    return;
+
+  DVLOG(1) << "WillStartRequest: url=" << request_->url();
+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(
+          &ShowDeleayedLoadingPage,
+          render_process_id_,
+          render_view_id_,
+          request_->url(),
+          base::Bind(
+              &MergeSessionThrottle::OnBlockingPageComplete,
+              AsWeakPtr())));
+  *defer = true;
+}
+
+void MergeSessionThrottle::OnBlockingPageComplete(bool proceed) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  if (proceed) {
+    controller()->Resume();
+  } else {
+    controller()->Cancel();
+  }
+}
+
+bool MergeSessionThrottle::ShouldShowMergeSessionPage(const GURL& url) const {
+  // If we are loading google properties while merge session is in progress,
+  // we will show delayed loading page instead.
+  return !net::NetworkChangeNotifier::IsOffline() &&
+         google_util::IsGoogleHostname(url.host(),
+                                       google_util::ALLOW_SUBDOMAIN) &&
+         chromeos::UserManager::Get()->GetMergeSessionState() ==
+             chromeos::UserManager::MERGE_STATUS_IN_PROCESS;
+}