Keep NaCl plugins used in app background pages alive when active.

chrome/browser/nacl_host/nacl_browser_delegate_impl.h

 // 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.
 
 #ifndef CHROME_BROWSER_NACL_HOST_NACL_BROWSER_DELEGATE_IMPL_H_
 #define CHROME_BROWSER_NACL_HOST_NACL_BROWSER_DELEGATE_IMPL_H_
 
 #include "base/compiler_specific.h"
-#include "components/nacl/common/nacl_browser_delegate.h"
+#include "components/nacl/browser/nacl_browser_delegate.h"
 #include "extensions/browser/info_map.h"
 
 class NaClBrowserDelegateImpl : public NaClBrowserDelegate {
  public:
   explicit NaClBrowserDelegateImpl(extensions::InfoMap* extension_info_map);
   virtual ~NaClBrowserDelegateImpl();
 
   virtual void ShowNaClInfobar(int render_process_id, int render_view_id,
                                int error_id) OVERRIDE;
   virtual bool DialogsAreSuppressed() OVERRIDE;
   virtual bool GetCacheDirectory(base::FilePath* cache_dir) OVERRIDE;
   virtual bool GetPluginDirectory(base::FilePath* plugin_dir) OVERRIDE;
   virtual bool GetPnaclDirectory(base::FilePath* pnacl_dir) OVERRIDE;
   virtual bool GetUserDirectory(base::FilePath* user_dir) OVERRIDE;
   virtual std::string GetVersionString() const OVERRIDE;
   virtual ppapi::host::HostFactory* CreatePpapiHostFactory(
       content::BrowserPpapiHost* ppapi_host) OVERRIDE;
   virtual bool MapUrlToLocalFilePath(const GURL& url,
                                      bool is_blocking,
                                      base::FilePath* file_path) OVERRIDE;
   virtual void SetDebugPatterns(std::string debug_patterns) OVERRIDE;
   virtual bool URLMatchesDebugPatterns(const GURL& manifest_url) OVERRIDE;
+  virtual const content::BrowserPpapiHost::OnIdleChangeCallback

[yzshen1, 2013/11/21 18:01:50]

why do we need 'const' here?

[scheib, 2013/12/11 21:35:40]

Done. We don't.

+      GetOnIdleChangeCallback() OVERRIDE;
 
  private:
   scoped_refptr<extensions::InfoMap> extension_info_map_;
   std::vector<URLPattern> debug_patterns_;
   bool inverse_debug_patterns_;
   DISALLOW_COPY_AND_ASSIGN(NaClBrowserDelegateImpl);
 };
 
 
 #endif  // CHROME_BROWSER_NACL_HOST_NACL_BROWSER_DELEGATE_IMPL_H_