Hidden windows should not keep Chrome alive.

extensions/browser/app_window/app_window.cc

 // Copyright 2014 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 "extensions/browser/app_window/app_window.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 642 matching lines @@
   gfx::Size constrained_size = constraints.ClampSize(bounds.size());
   if (bounds.size() != constrained_size) {
     bounds.set_size(constrained_size);
     bounds.Inset(-native_app_window_->GetFrameInsets());
     native_app_window_->SetBounds(bounds);
   }
   OnNativeWindowChanged();
 }
 
 void AppWindow::Show(ShowType show_type) {
+  app_delegate_->OnShow();
   bool was_hidden = is_hidden_ || !has_been_shown_;
   is_hidden_ = false;
 
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableAppsShowOnFirstPaint)) {
     show_on_first_paint_ = true;
 
     if (!first_paint_complete_) {
       delayed_show_type_ = show_type;
       return;
@@ skipping 16 matching lines @@
 
 void AppWindow::Hide() {
   // This is there to prevent race conditions with Hide() being called before
   // there was a non-empty paint. It should have no effect in a non-racy
   // scenario where the application is hiding then showing a window: the second
   // show will not be delayed.
   is_hidden_ = true;
   show_on_first_paint_ = false;
   GetBaseWindow()->Hide();
   AppWindowRegistry::Get(browser_context_)->AppWindowHidden(this);
+  app_delegate_->OnHide();
 }
 
 void AppWindow::SetAlwaysOnTop(bool always_on_top) {
   if (cached_always_on_top_ == always_on_top)
     return;
 
   cached_always_on_top_ = always_on_top;
 
   // As a security measure, do not allow fullscreen windows or windows that
   // overlap the taskbar to be on top. The property will be applied when the
@@ skipping 400 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 extensions