Declare providing extension capabilities in the manifest.

chrome/common/extensions/api/file_system_provider.idl

Index: chrome/common/extensions/api/file_system_provider.idl
diff --git a/chrome/common/extensions/api/file_system_provider.idl b/chrome/common/extensions/api/file_system_provider.idl
index 0772f2c337a78cf5053da65f4d79d8a846b489e4..6c30f919660872cb147b26afa0853e54d97351de 100644
--- a/chrome/common/extensions/api/file_system_provider.idl
+++ b/chrome/common/extensions/api/file_system_provider.idl
@@ -41,20 +41,34 @@ namespace fileSystemProvider {
     DELETED
   };
 
-  // Source of the file system data.
-  enum FileSystemSource {
-    // The file system is handling a file, eg. an archive file obtained via the
+  // Source of data for provided file systems. Used in manifest files of
+  // providing extensions.
+  enum Source {
+    // File systems are handling files, eg. an archive file obtained via the
     // <code>onLaunched</code> event and the <code>file_handlers</code> manifest
     // entry.
-    FILE,
+    file,
 
-    // The file system contents are fetched from an external device, such as a
+    // File systems' contents are fetched from an external device, such as a
     // USB device, but not via <code>file_handlers</code>.
-    DEVICE,
+    device,
 
-    // The file system is network based. The contents are obtained from another
+    // File systems are network based. The contents are obtained from another
     // server or local network. Eg. cloud services.
-    NETWORK
+    network
+  };
+
+  // Represents capabilities of a providing extension. Used in manifest files of
+  // providing extensions.
+  dictionary Capabilities {
+    // Whether configuring via <code>onConfigureRequested</code> is supported.
+    boolean configurable;
+
+    // Whether multiple (more than one) mounted file systems are supported.
+    boolean multiple_mounts;
+
+    // Source of data for all mounted file systems.
+    Source source;
   };
 
   // Represents metadata of a file or a directory.
@@ -125,9 +139,6 @@ namespace fileSystemProvider {
     // List of currently opened files.
     OpenedFile[] openedFiles;
 
-    // Source of the file system data.
-    FileSystemSource? source;
-
     // Whether the file system supports the <code>tag</code> field for observing
     // directories.
     [nodoc] boolean? supportsNotifyTag;
@@ -153,9 +164,6 @@ namespace fileSystemProvider {
     // or 0, then not limited.
     long? openedFilesLimit;
 
-    // Source of the file system data.
-    FileSystemSource? source;
-
     // Whether the file system supports the <code>tag</code> field for observed
     // directories. Required in order to enable the internal cache.
     [nodoc] boolean? supportsNotifyTag;