Declare providing extension capabilities in the manifest.

chrome/browser/chromeos/file_system_provider/service.h

Index: chrome/browser/chromeos/file_system_provider/service.h
diff --git a/chrome/browser/chromeos/file_system_provider/service.h b/chrome/browser/chromeos/file_system_provider/service.h
index d2477f5667ddcc555910013552c84e93d57739f0..855303c65345967ec27a57aa0e60e413d7a3b655 100644
--- a/chrome/browser/chromeos/file_system_provider/service.h
+++ b/chrome/browser/chromeos/file_system_provider/service.h
@@ -23,6 +23,7 @@
 #include "chrome/browser/chromeos/file_system_provider/watcher.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/file_system_provider.h"
+#include "chrome/common/extensions/api/file_system_provider/file_system_provider_handler.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/browser_context.h"
 #include "extensions/browser/extension_registry_observer.h"
@@ -52,13 +53,14 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
 // Holds information for a providing extension.
 struct ProvidingExtensionInfo {
+  typedef extensions::FileSystemProviderCapabilities Capabilities;

[not at google - send to devlin, 2015/04/24 17:49:30]

prefer not to typedef things in the header file, though if you really need to
for some reason, IIRC it should be "using Capabilities =
extensions::FileSystemProviderCapabilities";

[mtomasz, 2015/05/07 03:33:59]

Done.

+
   ProvidingExtensionInfo();
   ~ProvidingExtensionInfo();
 
   std::string extension_id;
   std::string name;
-  bool can_configure;
-  bool can_add;
+  Capabilities capabilities;
 };
 
 // Manages and registers the file system provider service. Maintains provided