Implement experimental app banner flow.

chrome/browser/banners/app_banner_manager_browsertest.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 <vector>
 
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
@@ skipping 53 matching lines @@
 
   bool need_to_log_status() { return need_to_log_status_; }
 
   void Prepare(base::Closure quit_closure) {
     quit_closure_ = quit_closure;
   }
 
  protected:
   // All calls to RequestAppBanner should terminate in one of Stop() (not
   // showing banner), UpdateState(State::PENDING_ENGAGEMENT) (waiting for
-  // sufficient engagement), or ShowBanner(). Override these methods to capture
-  // test status.
+  // sufficient engagement), or ShowBannerUI(). Override these methods to
+  // capture test status.
   void Stop() override {
     AppBannerManager::Stop();
     ASSERT_FALSE(will_show_.get());
     will_show_.reset(new bool(false));
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, quit_closure_);
   }
 
-  void ShowBanner() override {
+  void ShowBannerUI() override {
     // Fake the call to ReportStatus here - this is usually called in
     // platform-specific code which is not exposed here.
     ReportStatus(nullptr, SHOWING_WEB_APP_BANNER);
     RecordDidShowBanner("AppBanner.WebApp.Shown");
 
     ASSERT_FALSE(will_show_.get());
     will_show_.reset(new bool(true));
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, quit_closure_);
   }
 
@@ skipping 430 matching lines @@
   EXPECT_FALSE(manager->will_show());
   EXPECT_FALSE(manager->is_active());
   EXPECT_FALSE(manager->need_to_log_status());
 
   histograms.ExpectTotalCount(banners::kMinutesHistogram, 0);
   histograms.ExpectUniqueSample(banners::kInstallableStatusCodeHistogram,
                                 INSUFFICIENT_ENGAGEMENT, 1);
 }
 
 }  // namespace banners