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

components/nacl/common/nacl_browser_delegate.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 COMPONENTS_NACL_COMMON_NACL_BROWSER_DELEGATE_H_
-#define COMPONENTS_NACL_COMMON_NACL_BROWSER_DELEGATE_H_
-
-#include <string>
-
-#include "base/callback_forward.h"
-
-class GURL;
-
-namespace base {
-class FilePath;
-}
-
-namespace ppapi {
-namespace host {
-class HostFactory;
-}
-}
-
-namespace content {
-class BrowserPpapiHost;
-}
-
-// Encapsulates the dependencies of NaCl code on chrome/, to avoid a direct
-// dependency on chrome/.
-class NaClBrowserDelegate {
- public:
-  virtual ~NaClBrowserDelegate() {}
-
-  // Show an infobar to the user.
-  virtual void ShowNaClInfobar(int render_process_id, int render_view_id,
-                               int error_id) = 0;
-  // Returns whether dialogs are allowed. This is used to decide if to add the
-  // command line switch kNoErrorDialogs.
-  virtual bool DialogsAreSuppressed() = 0;
-  // Returns true on success, false otherwise. On success |cache_dir| contains
-  // the cache directory. On failure, it is not changed.
-  virtual bool GetCacheDirectory(base::FilePath* cache_dir) = 0;
-  // Returns true on success, false otherwise. On success |plugin_dir| contains
-  // the directory where the plugins are located. On failure, it is not
-  // changed.
-  virtual bool GetPluginDirectory(base::FilePath* plugin_dir) = 0;
-  // Returns true on success, false otherwise. On success |pnacl_dir| contains
-  // the directory where the PNaCl files are located. On failure, it is not
-  // changed.
-  virtual bool GetPnaclDirectory(base::FilePath* pnacl_dir) = 0;
-  // Returns true on success, false otherwise. On success |user_dir| contains
-  // the user data directory. On failure, it is not changed.
-  virtual bool GetUserDirectory(base::FilePath* user_dir) = 0;
-  // Returns the version as a string. This string is used to invalidate
-  // validator cache entries when Chromium is upgraded
-  virtual std::string GetVersionString() const = 0;
-  // Returns a HostFactory that hides the details of its embedder.
-  virtual ppapi::host::HostFactory* CreatePpapiHostFactory(
-      content::BrowserPpapiHost* ppapi_host) = 0;
-  // Returns true on success, false otherwise. On success, map |url| to a
-  // full pathname of a file in the local filesystem. |file_path| should not be
-  // changed on failure. This mapping should be a best effort, for example,
-  // "chrome-extension:" could be mapped to the location of unpacked
-  // extensions. If this method is called in a blocking thread you should set
-  // |use_blocking_api| to true, so calling blocking file API is allowed
-  // otherwise non blocking API will be used (which only handles a subset of the
-  // urls checking only the url scheme against kExtensionScheme).
-  virtual bool MapUrlToLocalFilePath(const GURL& url,
-                                     bool use_blocking_api,
-                                     base::FilePath* file_path) = 0;
-  // Set match patterns which will be checked before enabling debug stub.
-  virtual void SetDebugPatterns(std::string debug_patterns) = 0;
-
-  // Returns whether NaCl application with this manifest URL should be debugged.
-  virtual bool URLMatchesDebugPatterns(const GURL& manifest_url) = 0;
-};
-
-#endif  // COMPONENTS_NACL_COMMON_NACL_BROWSER_DELEGATE_H_