Add PPDProvider barebones implementation and associated cache skeleton.

chromeos/chromeos_paths.h

Index: chromeos/chromeos_paths.h
diff --git a/chromeos/chromeos_paths.h b/chromeos/chromeos_paths.h
index 297e68a3b1084d832287901234b35a135f41a137..5ceae7d89767727a3251a85387280936be582f3e 100644
--- a/chromeos/chromeos_paths.h
+++ b/chromeos/chromeos_paths.h
@@ -19,23 +19,23 @@ 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.
@@ -50,6 +50,8 @@ enum {
                                           // 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
 };