[fsp] Introduce file_system_provider::Service class for the FileSystemProvider API.

chrome/browser/chromeos/file_manager/volume_manager.h

Index: chrome/browser/chromeos/file_manager/volume_manager.h
diff --git a/chrome/browser/chromeos/file_manager/volume_manager.h b/chrome/browser/chromeos/file_manager/volume_manager.h
index 7311fccc0d805cdf9e49221260fb4ccfae58281d..3471652ef45bea106ed28e103fa6eeb686f52ebf 100644
--- a/chrome/browser/chromeos/file_manager/volume_manager.h
+++ b/chrome/browser/chromeos/file_manager/volume_manager.h
@@ -14,6 +14,8 @@
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/chromeos/drive/drive_integration_service.h"
+#include "chrome/browser/chromeos/file_system_provider/observer.h"
+#include "chrome/browser/chromeos/file_system_provider/service.h"
 #include "chrome/browser/local_discovery/storage/privet_volume_lister.h"
 #include "chromeos/dbus/cros_disks_client.h"
 #include "chromeos/disks/disk_mount_manager.h"
@@ -46,6 +48,7 @@ enum VolumeType {
   VOLUME_TYPE_REMOVABLE_DISK_PARTITION,
   VOLUME_TYPE_MOUNTED_ARCHIVE_FILE,
   VOLUME_TYPE_CLOUD_DEVICE,
+  VOLUME_TYPE_PROVIDED,  // File system provided by the FileSystemProvider API.
   VOLUME_TYPE_TESTING
 };
 
@@ -100,12 +103,15 @@ struct VolumeInfo {
 // - Mounted zip archives.
 class VolumeManager : public KeyedService,
                       public drive::DriveIntegrationServiceObserver,
-                      public chromeos::disks::DiskMountManager::Observer {
+                      public chromeos::disks::DiskMountManager::Observer,
+                      public chromeos::file_system_provider::Observer {
  public:
-  VolumeManager(Profile* profile,
-                drive::DriveIntegrationService* drive_integration_service,
-                chromeos::PowerManagerClient* power_manager_client,
-                chromeos::disks::DiskMountManager* disk_mount_manager);
+  VolumeManager(
+      Profile* profile,
+      drive::DriveIntegrationService* drive_integration_service,
+      chromeos::PowerManagerClient* power_manager_client,
+      chromeos::disks::DiskMountManager* disk_mount_manager,
+      chromeos::file_system_provider::Service* file_system_provider_service);
   virtual ~VolumeManager();
 
   // Returns the instance corresponding to the |context|.
@@ -162,6 +168,14 @@ class VolumeManager : public KeyedService,
       chromeos::FormatError error_code,
       const std::string& device_path) OVERRIDE;
 
+  // chromeos::file_system_provider::Observer overrides.
+  virtual void OnProvidedFileSystemRegistered(
+      const chromeos::file_system_provider::ProvidedFileSystem& file_system)
+      OVERRIDE;
+  virtual void OnProvidedFileSystemUnregistered(
+      const chromeos::file_system_provider::ProvidedFileSystem& file_system)
+      OVERRIDE;
+
   // Called on change to kExternalStorageDisabled pref.
   void OnExternalStorageDisabledChanged();
 
@@ -175,13 +189,14 @@ class VolumeManager : public KeyedService,
                       const VolumeInfo& volume_info);
 
   Profile* profile_;
-  drive::DriveIntegrationService* drive_integration_service_;
-  chromeos::disks::DiskMountManager* disk_mount_manager_;
+  drive::DriveIntegrationService* drive_integration_service_;  // Not owned.
+  chromeos::disks::DiskMountManager* disk_mount_manager_;      // Not owned.
   scoped_ptr<MountedDiskMonitor> mounted_disk_monitor_;
   PrefChangeRegistrar pref_change_registrar_;
   ObserverList<VolumeManagerObserver> observers_;
   scoped_ptr<local_discovery::PrivetVolumeLister> privet_volume_lister_;
-
+  chromeos::file_system_provider::Service*
+      file_system_provider_service_;  // Not owned by this class.
   std::map<std::string, VolumeInfo> mounted_volumes_;
 
   DISALLOW_COPY_AND_ASSIGN(VolumeManager);