[Background Sync] Align exposed API with spec

third_party/WebKit/Source/modules/background_sync/SyncManager.idl

Index: third_party/WebKit/Source/modules/background_sync/SyncManager.idl
diff --git a/third_party/WebKit/Source/modules/background_sync/SyncManager.idl b/third_party/WebKit/Source/modules/background_sync/SyncManager.idl
index 30f3ada46afd8e94e169bf4d78443cf43c0d9bf6..6d048dc2be3d8b67337cbc56bd5596847817d475 100644
--- a/third_party/WebKit/Source/modules/background_sync/SyncManager.idl
+++ b/third_party/WebKit/Source/modules/background_sync/SyncManager.idl
@@ -14,8 +14,6 @@ enum SyncPermissionState {
     RuntimeEnabled=BackgroundSync,
     TypeChecking=Interface,
 ] interface SyncManager {
-    [CallWith=(ScriptState,ExecutionContext),ImplementedAs=registerFunction] Promise<SyncRegistration> register([RuntimeEnabled=BackgroundSyncV2] optional SyncRegistrationOptions options);
-    [CallWith=ScriptState] Promise<SyncRegistration> getRegistration(DOMString tag);
-    [CallWith=ScriptState] Promise<sequence<SyncRegistration>> getRegistrations();
-    [RuntimeEnabled=BackgroundSyncV2, CallWith=ScriptState] Promise<SyncPermissionState> permissionState();
+    [CallWith=(ScriptState,ExecutionContext),ImplementedAs=registerFunction] Promise<void> register(DOMString tag);

[jkarlin, 2015/11/12 17:29:41]

Can you add MeasureAs=BackgroundSyncRegister? So it looks like..

[MeasureAs=BackgroundSyncRegister,CallWith=(ScriptState,ExecutionContext),ImplementedAs=registerFunction]
Pro
    mise<void> register(DOMString tag);

And also add BackgroundSyncRegister to UseCounter.h

That will give us an idea of sync usage. 

+    [CallWith=ScriptState] Promise<sequence<DOMString>> getTags();
 };