Add PPDProvider barebones implementation and associated cache skeleton.

chromeos/chromeos_paths.h

 // Copyright (c) 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 CHROMEOS_CHROMEOS_PATHS_H_
 #define CHROMEOS_CHROMEOS_PATHS_H_
 
 #include "chromeos/chromeos_export.h"
 
 namespace base {
 class FilePath;
 }
 
 // This file declares path keys for the chromeos module.  These can be used with
 // the PathService to access various special directories and files.
 
 namespace chromeos {
 
 enum {
   PATH_START = 7000,
 
-  FILE_DEFAULT_APP_ORDER,       // Full path to the json file that defines the
-                                // default app order.
-  DIR_USER_POLICY_KEYS,         // Directory where the session_manager stores
-                                // the user policy keys.
-  FILE_OWNER_KEY,               // Full path to the owner key file.
-  FILE_INSTALL_ATTRIBUTES,      // Full path to the install attributes file.
-  FILE_MACHINE_INFO,            // Full path to machine hardware info file.
-  FILE_UPTIME,                  // Full path to the file via which the kernel
-                                // exposes the current device uptime.
+  FILE_DEFAULT_APP_ORDER,   // Full path to the json file that defines the
+                            // default app order.
+  DIR_USER_POLICY_KEYS,     // Directory where the session_manager stores
+                            // the user policy keys.
+  FILE_OWNER_KEY,           // Full path to the owner key file.
+  FILE_INSTALL_ATTRIBUTES,  // Full path to the install attributes file.
+  FILE_MACHINE_INFO,        // Full path to machine hardware info file.
+  FILE_UPTIME,              // Full path to the file via which the kernel
+                            // exposes the current device uptime.
   FILE_UPDATE_REBOOT_NEEDED_UPTIME,  // Full path to a file in which Chrome can
                                      // store the uptime at which an update
                                      // became necessary. The file should be
                                      // cleared on boot.
-  DIR_DEVICE_LOCAL_ACCOUNT_EXTENSIONS,  // Directory under which a cache of
-                                        // force-installed extensions is
-                                        // maintained for each device-local
-                                        // account.
+  DIR_DEVICE_LOCAL_ACCOUNT_EXTENSIONS,     // Directory under which a cache of
+                                           // force-installed extensions is
+                                           // maintained for each device-local
+                                           // account.
   DIR_DEVICE_LOCAL_ACCOUNT_EXTERNAL_DATA,  // Directory where external data
                                            // referenced by policies is cached
                                            // for device-local accounts.
   DIR_DEVICE_LOCAL_ACCOUNT_COMPONENT_POLICY,  // Directory where policy for
                                               // components is stored for
                                               // device-local accounts.
                                               // Currently this is used for
                                               // policy for extensions.
   DIR_DEVICE_DISPLAY_PROFILES,  // Destination directory for system display
                                 // profiles downloaded from Quirks Server.
   DIR_DEVICE_COLOR_CALIBRATION_PROFILES,  // Directory where system color
                                           // calibration files can be found.
   DIR_DEVICE_EXTENSION_LOCAL_CACHE,  // Directory where extension local cache
                                      // is stored.
+  DIR_PRINTER_DRIVERS_CACHE,         // Directory where ppds previously used

[skau, 2016/10/07 16:29:06]

It looks like this file is for chromeos system folders where we're dealing with
user data.  Take a look at CHROMEOS_WALLPAPER here: chrome/common/chrome_paths.h

[Carlson, 2016/10/14 19:28:56]

Done.

+                                     // for printing are stored.
   PATH_END
 };
 
 // Call once to register the provider for the path keys defined above.
 CHROMEOS_EXPORT void RegisterPathProvider();
 
 // Overrides some of the paths listed above so that those files can be used
 // when not running on ChromeOS. The stubs files will be relative to
 // |stubs_dir|. It is not valid to call this when running on ChromeOS.
 CHROMEOS_EXPORT void RegisterStubPathOverrides(const base::FilePath& stubs_dir);
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_CHROMEOS_PATHS_H_