Fix crash in the experimental app list StartPageView.

ui/app_list/test/app_list_test_view_delegate.cc

 // Copyright 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 "ui/app_list/test/app_list_test_view_delegate.h"
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
@@ skipping 35 matching lines @@
 
  private:
   bool signed_in_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSigninDelegate);
 };
 
 AppListTestViewDelegate::AppListTestViewDelegate()
     : dismiss_count_(0),
       open_search_result_count_(0),
+      next_profile_app_count_(0),
       test_signin_delegate_(new TestSigninDelegate),
       model_(new AppListTestModel),
       speech_ui_(SPEECH_RECOGNITION_OFF) {
 }
 
 AppListTestViewDelegate::~AppListTestViewDelegate() {}
 
 void AppListTestViewDelegate::SetSignedIn(bool signed_in) {
   test_signin_delegate_->set_signed_in(signed_in);
   FOR_EACH_OBSERVER(AppListViewDelegateObserver,
                     observers_,
                     OnProfilesChanged());
 }
 
 bool AppListTestViewDelegate::ForceNativeDesktop() const {
   return false;
 }
 
+void AppListTestViewDelegate::SetProfileByPath(
+    const base::FilePath& profile_path) {
+  ReplaceTestModel(next_profile_app_count_);
+}
+
 AppListModel* AppListTestViewDelegate::GetModel() {
   return model_.get();
 }
 
 SigninDelegate* AppListTestViewDelegate::GetSigninDelegate() {
   return test_signin_delegate_.get();
 }
 
 SpeechUIModel* AppListTestViewDelegate::GetSpeechUI() {
   return &speech_ui_;
@@ skipping 60 matching lines @@
   observers_.AddObserver(observer);
 }
 
 void AppListTestViewDelegate::RemoveObserver(
     AppListViewDelegateObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 }  // namespace test
 }  // namespace app_list