Fix the TabScrubber always starting from the first tab in full screen mode.

chrome/browser/ui/views/frame/immersive_mode_controller_ash.cc

 // Copyright 2012 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/ui/views/frame/immersive_mode_controller_ash.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/shared/immersive_revealed_lock.h"
 #include "ash/shell.h"
@@ skipping 257 matching lines @@
   for (Observer& observer : observers_)
     observer.OnImmersiveRevealStarted();
 }
 
 void ImmersiveModeControllerAsh::OnImmersiveRevealEnded() {
   DestroyMashRevealWidget();
   visible_fraction_ = 0;
   browser_view_->top_container()->DestroyLayer();
   UpdateTabIndicators();
   LayoutBrowserRootView();
+  for (Observer& observer : observers_)
+    observer.OnImmersiveRevealEnded();
 }
 
 void ImmersiveModeControllerAsh::OnImmersiveFullscreenExited() {
   DestroyMashRevealWidget();
   browser_view_->top_container()->DestroyLayer();
   UpdateTabIndicators();
   LayoutBrowserRootView();
 }
 
 void ImmersiveModeControllerAsh::SetVisibleFraction(double visible_fraction) {
@@ skipping 63 matching lines @@
   // the shelf completely and prevent it from being revealed.
   bool in_tab_fullscreen = content::Source<FullscreenController>(source)->
       IsWindowFullscreenForTabOrPending();
   ash::wm::GetWindowState(native_window_)
       ->set_hide_shelf_when_fullscreen(in_tab_fullscreen);
   ash::Shell::GetInstance()->UpdateShelfVisibility();
 
   if (tab_indicator_visibility_changed)
     LayoutBrowserRootView();
 }