Adds a first integration test for the Recent Tabs feature.

components/offline_pages/core/snapshot_controller_unittest.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 "components/offline_pages/core/snapshot_controller.h"
 
 #include "base/bind.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/test_mock_time_task_runner.h"
@@ skipping 66 matching lines @@
   // Onload should make snapshot after its delay.
   controller()->DocumentOnLoadCompletedInMainFrame();
   PumpLoop();
   EXPECT_EQ(0, snapshot_count());
   FastForwardBy(base::TimeDelta::FromMilliseconds(
       controller()->GetDelayAfterDocumentOnLoadCompletedForTest()));
   EXPECT_EQ(1, snapshot_count());
 }
 
 TEST_F(SnapshotControllerTest, OnDocumentAvailable) {
-  EXPECT_GT(controller()->GetDelayAfterDocumentAvailableForTest(), 0UL);
+  EXPECT_GT(controller()->GetDelayAfterDocumentAvailableForTest(), 0LL);
   // OnDOM should make snapshot after a delay.
   controller()->DocumentAvailableInMainFrame();
   PumpLoop();
   EXPECT_EQ(0, snapshot_count());
   FastForwardBy(base::TimeDelta::FromMilliseconds(
       controller()->GetDelayAfterDocumentAvailableForTest()));
   EXPECT_EQ(1, snapshot_count());
 }
 
 TEST_F(SnapshotControllerTest, OnLoadSnapshotIsTheLastOne) {
@@ skipping 83 matching lines @@
   controller()->PendingSnapshotCompleted();
   // Next snapshot should be initiated when new document is loaded.
   controller()->DocumentAvailableInMainFrame();
   FastForwardBy(base::TimeDelta::FromMilliseconds(
       controller()->GetDelayAfterDocumentAvailableForTest()));
   // No snapshot since session was reset.
   EXPECT_EQ(2, snapshot_count());
 }
 
 }  // namespace offline_pages