[Mac] Add Home button to Default Touch Bar

chrome/browser/ui/cocoa/browser_window_touch_bar_unittest.mm

 // Copyright 2017 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.
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/mac_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "chrome/app/chrome_command_ids.h"
 #import "chrome/browser/ui/cocoa/browser_window_touch_bar.h"
 #include "chrome/browser/ui/cocoa/test/cocoa_profile_test.h"
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class BrowserWindowTouchBarUnitTest : public CocoaProfileTest {
  public:
   void SetUp() override {
     CocoaProfileTest::SetUp();
     ASSERT_TRUE(browser());
-    browserWindowTouchBar_.reset(
-        [[BrowserWindowTouchBar alloc] initWithBrowser:browser()]);
+    browserWindowTouchBar_.reset([[BrowserWindowTouchBar alloc]
+                initWithBrowser:browser()
+        browserWindowController:nil]);
   }
 
   void TearDown() override { CocoaProfileTest::TearDown(); }
 
   base::scoped_nsobject<BrowserWindowTouchBar> browserWindowTouchBar_;
 };
 
 TEST_F(BrowserWindowTouchBarUnitTest, TouchBarItems) {
   if (!base::mac::IsAtLeastOS10_12())
     return;
 
-  NSTouchBar* touchBar = [browserWindowTouchBar_ makeTouchBar];
-  NSArray* touchBarItemIds = [touchBar itemIdentifiers];
+  PrefService* prefs = profile()->GetPrefs();
+  DCHECK(prefs);
+  prefs->SetBoolean(prefs::kShowHomeButton, true);
+
+  NSArray* touchBarItemIds =
+      [[browserWindowTouchBar_ makeTouchBar] itemIdentifiers];
   EXPECT_TRUE([touchBarItemIds containsObject:@"BackForwardTouchId"]);
   EXPECT_TRUE([touchBarItemIds containsObject:@"ReloadOrStopTouchId"]);
+  EXPECT_TRUE([touchBarItemIds containsObject:@"HomeTouchId"]);
   EXPECT_TRUE([touchBarItemIds containsObject:@"SearchTouchId"]);
   EXPECT_TRUE([touchBarItemIds containsObject:@"NewTabTouchId"]);
   EXPECT_TRUE([touchBarItemIds containsObject:@"StarTouchId"]);
+
+  prefs->SetBoolean(prefs::kShowHomeButton, false);
+  touchBarItemIds = [[browserWindowTouchBar_ makeTouchBar] itemIdentifiers];
+  EXPECT_TRUE([touchBarItemIds containsObject:@"BackForwardTouchId"]);
+  EXPECT_TRUE([touchBarItemIds containsObject:@"ReloadOrStopTouchId"]);
+  EXPECT_FALSE([touchBarItemIds containsObject:@"HomeTouchId"]);
+  EXPECT_TRUE([touchBarItemIds containsObject:@"SearchTouchId"]);
+  EXPECT_TRUE([touchBarItemIds containsObject:@"NewTabTouchId"]);
+  EXPECT_TRUE([touchBarItemIds containsObject:@"StarTouchId"]);
 }
 
 TEST_F(BrowserWindowTouchBarUnitTest, ReloadOrStopTouchBarItem) {
   if (!base::mac::IsAtLeastOS10_12())
     return;
 
   NSTouchBar* touchBar = [browserWindowTouchBar_ makeTouchBar];
   [browserWindowTouchBar_ setIsPageLoading:NO];
   NSTouchBarItem* item =
       [browserWindowTouchBar_ touchBar:touchBar
                  makeItemForIdentifier:@"ReloadOrStopTouchId"];
 
   EXPECT_EQ(IDC_RELOAD, [[item view] tag]);
 
   [browserWindowTouchBar_ setIsPageLoading:YES];
   item = [browserWindowTouchBar_ touchBar:touchBar
                     makeItemForIdentifier:@"ReloadOrStopTouchId"];
 
   EXPECT_EQ(IDC_STOP, [[item view] tag]);
 }