Add ability to have active window autohide shelf

components/exo/shell_surface.cc

 // Copyright 2015 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/exo/shell_surface.h"
 
 #include <algorithm>
 
 #include "ash/common/frame/custom_frame_view_ash.h"
 #include "ash/common/shelf/wm_shelf.h"
@@ skipping 460 matching lines @@
     // state. In this implementation, we may loose the previous state,
     // if the previous state is fullscreen, etc.
     if (ash::wm::GetWindowState(widget_->GetNativeWindow())->IsPinned())
       widget_->Restore();
   }
 }
 
 void ShellSurface::SetSystemUiVisibility(bool autohide) {
   TRACE_EVENT1("exo", "ShellSurface::SetSystemUiVisibility", "autohide",
                autohide);
-  // TODO: Implemented in next CL. crbug.com/705723
-  NOTIMPLEMENTED();
+  ash::wm::SetAutoHideShelf(widget_->GetNativeWindow(), autohide);
 }
 
 void ShellSurface::SetTitle(const base::string16& title) {
   TRACE_EVENT1("exo", "ShellSurface::SetTitle", "title",
                base::UTF16ToUTF8(title));
 
   title_ = title;
   if (widget_)
     widget_->UpdateWindowTitle();
 }
@@ skipping 1101 matching lines @@
     // small style shadow for them.
     if (!activatable_)
       shadow->SetElevation(wm::ShadowElevation::SMALL);
     // We don't have rounded corners unless frame is enabled.
     if (!frame_enabled_)
       shadow->SetRoundedCornerRadius(0);
   }
 }
 
 }  // namespace exo