add stackframe paging support to debug protocol and node-debug

extensions/node-debug/node-debug.azure.json

 {
 	"account": "monacobuild",
 	"container": "debuggers",
-	"zip": "63e4d82/node-debug.zip",
+	"zip": "3fb9a7f/node-debug.zip",
 	"output": ""
 }

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

@@ -382,6 +382,8 @@ declare module DebugProtocol {
 	export interface StackTraceArguments {
 		/** Retrieve the stacktrace for this thread. */
 		threadId: number;
+		/** the index of the first frames to return; if omitted frames start at 0. */
+		startFrame?: number;
 		/** The maximum number of frames to return. If levels is not specified or 0, all frames are returned. */
 		levels?: number;
 	}
@@ -391,6 +393,8 @@ declare module DebugProtocol {
 			/** The frames of the stackframe. If the array has length zero, there are no stackframes available.
 				This means that there is no location information available. */
 			stackFrames: StackFrame[];
+			/** The total number of frames available. */
+			totalFrames?: number;
 		};
 	}