mediaview: Skeleton for ARC Documents Provider FS.

chrome/browser/chromeos/fileapi/file_system_backend.cc

Index: chrome/browser/chromeos/fileapi/file_system_backend.cc
diff --git a/chrome/browser/chromeos/fileapi/file_system_backend.cc b/chrome/browser/chromeos/fileapi/file_system_backend.cc
index d81fc877bb4719a617840d4475509519b3ef8ef6..9992f284d652bc2040afdbfd20f34c188142c04f 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend.cc
+++ b/chrome/browser/chromeos/fileapi/file_system_backend.cc
@@ -49,7 +49,8 @@ bool FileSystemBackend::CanHandleURL(const storage::FileSystemURL& url) {
          url.type() == storage::kFileSystemTypeDrive ||
          url.type() == storage::kFileSystemTypeProvided ||
          url.type() == storage::kFileSystemTypeDeviceMediaAsFileStorage ||
-         url.type() == storage::kFileSystemTypeArcContent;
+         url.type() == storage::kFileSystemTypeArcContent ||
+         url.type() == storage::kFileSystemTypeArcDocumentsProvider;
 }
 
 FileSystemBackend::FileSystemBackend(
@@ -57,6 +58,7 @@ FileSystemBackend::FileSystemBackend(
     std::unique_ptr<FileSystemBackendDelegate> file_system_provider_delegate,
     std::unique_ptr<FileSystemBackendDelegate> mtp_delegate,
     std::unique_ptr<FileSystemBackendDelegate> arc_content_delegate,
+    std::unique_ptr<FileSystemBackendDelegate> arc_documents_provider_delegate,
     scoped_refptr<storage::ExternalMountPoints> mount_points,
     storage::ExternalMountPoints* system_mount_points)
     : file_access_permissions_(new FileAccessPermissions()),
@@ -65,6 +67,8 @@ FileSystemBackend::FileSystemBackend(
       file_system_provider_delegate_(std::move(file_system_provider_delegate)),
       mtp_delegate_(std::move(mtp_delegate)),
       arc_content_delegate_(std::move(arc_content_delegate)),
+      arc_documents_provider_delegate_(
+          std::move(arc_documents_provider_delegate)),
       mount_points_(mount_points),
       system_mount_points_(system_mount_points) {}
 
@@ -101,6 +105,7 @@ bool FileSystemBackend::CanHandleType(storage::FileSystemType type) const {
     case storage::kFileSystemTypeDeviceMediaAsFileStorage:
     case storage::kFileSystemTypeProvided:
     case storage::kFileSystemTypeArcContent:
+    case storage::kFileSystemTypeArcDocumentsProvider:
       return true;
     default:
       return false;
@@ -253,6 +258,8 @@ storage::AsyncFileUtil* FileSystemBackend::GetAsyncFileUtil(
       return mtp_delegate_->GetAsyncFileUtil(type);
     case storage::kFileSystemTypeArcContent:
       return arc_content_delegate_->GetAsyncFileUtil(type);
+    case storage::kFileSystemTypeArcDocumentsProvider:
+      return arc_documents_provider_delegate_->GetAsyncFileUtil(type);
     default:
       NOTREACHED();
   }
@@ -306,7 +313,8 @@ storage::FileSystemOperation* FileSystemBackend::CreateFileSystemOperation(
          url.type() == storage::kFileSystemTypeRestrictedNativeLocal ||
          url.type() == storage::kFileSystemTypeDrive ||
          url.type() == storage::kFileSystemTypeProvided ||
-         url.type() == storage::kFileSystemTypeArcContent);
+         url.type() == storage::kFileSystemTypeArcContent ||
+         url.type() == storage::kFileSystemTypeArcDocumentsProvider);
   return storage::FileSystemOperation::Create(
       url, context,
       base::MakeUnique<storage::FileSystemOperationContext>(context));
@@ -317,7 +325,8 @@ bool FileSystemBackend::SupportsStreaming(
   return url.type() == storage::kFileSystemTypeDrive ||
          url.type() == storage::kFileSystemTypeProvided ||
          url.type() == storage::kFileSystemTypeDeviceMediaAsFileStorage ||
-         url.type() == storage::kFileSystemTypeArcContent;
+         url.type() == storage::kFileSystemTypeArcContent ||
+         url.type() == storage::kFileSystemTypeArcDocumentsProvider;
 }
 
 bool FileSystemBackend::HasInplaceCopyImplementation(
@@ -330,6 +339,7 @@ bool FileSystemBackend::HasInplaceCopyImplementation(
     case storage::kFileSystemTypeNativeLocal:
     case storage::kFileSystemTypeRestrictedNativeLocal:
     case storage::kFileSystemTypeArcContent:
+    case storage::kFileSystemTypeArcDocumentsProvider:
       return false;
     default:
       NOTREACHED();
@@ -367,6 +377,9 @@ FileSystemBackend::CreateFileStreamReader(
     case storage::kFileSystemTypeArcContent:
       return arc_content_delegate_->CreateFileStreamReader(
           url, offset, max_bytes_to_read, expected_modification_time, context);
+    case storage::kFileSystemTypeArcDocumentsProvider:
+      return arc_documents_provider_delegate_->CreateFileStreamReader(
+          url, offset, max_bytes_to_read, expected_modification_time, context);
     default:
       NOTREACHED();
   }
@@ -399,6 +412,7 @@ FileSystemBackend::CreateFileStreamWriter(
     // Read only file systems.
     case storage::kFileSystemTypeRestrictedNativeLocal:
     case storage::kFileSystemTypeArcContent:
+    case storage::kFileSystemTypeArcDocumentsProvider:
       return std::unique_ptr<storage::FileStreamWriter>();
     default:
       NOTREACHED();
@@ -434,6 +448,7 @@ void FileSystemBackend::GetRedirectURLForContents(
     case storage::kFileSystemTypeNativeLocal:
     case storage::kFileSystemTypeRestrictedNativeLocal:
     case storage::kFileSystemTypeArcContent:
+    case storage::kFileSystemTypeArcDocumentsProvider:
       callback.Run(GURL());
       return;
     default: