Add always-on-top property to app windows

apps/shell_window.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 "apps/shell_window.h"
 
 #include "apps/native_app_window.h"
 #include "apps/shell_window_geometry_cache.h"
 #include "apps/shell_window_registry.h"
 #include "base/strings/string_util.h"
@@ skipping 47 matching lines @@
 
 ShellWindow::CreateParams::CreateParams()
   : window_type(ShellWindow::WINDOW_TYPE_DEFAULT),
     frame(ShellWindow::FRAME_CHROME),
     transparent_background(false),
     bounds(INT_MIN, INT_MIN, 0, 0),
     creator_process_id(0),
     state(ui::SHOW_STATE_DEFAULT),
     hidden(false),
     resizable(true),
-    focused(true) {}
+    focused(true),
+    always_on_top(false) {}
 
 ShellWindow::CreateParams::~CreateParams() {}
 
 ShellWindow::Delegate::~Delegate() {}
 
 ShellWindow::ShellWindow(Profile* profile,
                          Delegate* delegate,
                          const extensions::Extension* extension)
     : profile_(profile),
       extension_(extension),
@@ skipping 576 matching lines @@
         region.bounds.x(),
         region.bounds.y(),
         region.bounds.right(),
         region.bounds.bottom(),
         region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
   }
   return sk_region;
 }
 
 }  // namespace apps