debug protocol: add presentation hint to source

src/vs/workbench/parts/debug/common/debugProtocol.d.ts

@@ -1048,6 +1048,8 @@ declare module DebugProtocol {
 		path?: string;
 		/** If sourceReference > 0 the contents of the source must be retrieved through the SourceRequest (even if a path is specified). A sourceReference is only valid for a session, so it must not be used to persist a source. */
 		sourceReference?: number;
+		/** An optional hint for how to present the source in the UI. A value of 'deemphasize' can be used to indicate that the source is not available or that it is skipped on stepping. */
+		presentationHint?: 'emphasize' | 'deemphasize';
 		/** The (optional) origin of this source: possible values 'internal module', 'inlined content from source map', etc. */
 		origin?: string;
 		/** Optional data that a debug adapter might want to loop through the client. The client should leave the data intact and persist it across sessions. The client should not interpret the data. */