mediaview: Mount ARC documents provider file system volumes.

chrome/browser/chromeos/arc/fileapi/arc_file_system_service.cc

Index: chrome/browser/chromeos/arc/fileapi/arc_file_system_service.cc
diff --git a/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.cc b/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.cc
index 11e02901214ce1564648d02a178140aa523b1a11..fc43a8fa023c5fda52b0060340ce4bf11158e125 100644
--- a/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.cc
+++ b/chrome/browser/chromeos/arc/fileapi/arc_file_system_service.cc
@@ -8,6 +8,7 @@
 #include "chrome/browser/chromeos/arc/fileapi/arc_content_file_system_url_util.h"
 #include "chrome/browser/chromeos/arc/fileapi/arc_documents_provider_util.h"
 #include "components/arc/arc_bridge_service.h"
+#include "components/arc/file_system/arc_file_system_observer.h"
 #include "content/public/browser/browser_thread.h"
 #include "storage/browser/fileapi/external_mount_points.h"
 
@@ -31,11 +32,15 @@ ArcFileSystemService::ArcFileSystemService(ArcBridgeService* bridge_service)
       storage::kFileSystemTypeArcDocumentsProvider,
       storage::FileSystemMountOption(),
       base::FilePath(kDocumentsProviderMountPointPath));
+
+  arc_bridge_service()->file_system()->AddObserver(this);
 }
 
 ArcFileSystemService::~ArcFileSystemService() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
+  arc_bridge_service()->file_system()->RemoveObserver(this);
+
   storage::ExternalMountPoints* mount_points =
       storage::ExternalMountPoints::GetSystemInstance();
 
@@ -43,4 +48,17 @@ ArcFileSystemService::~ArcFileSystemService() {
   mount_points->RevokeFileSystem(kDocumentsProviderMountPointPath);
 }
 
+void ArcFileSystemService::AddObserver(ArcFileSystemObserver* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void ArcFileSystemService::RemoveObserver(ArcFileSystemObserver* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
+void ArcFileSystemService::OnInstanceReady() {
+  for (auto& observer : observer_list_)
+    observer.OnFileSystemsReady();
+}
+
 }  // namespace arc