Change getContext to SpanBaseModel

Author: eduardoemery

packages/opencensus-core/src/trace/model/root-span.ts

@@ -47,14 +47,6 @@ export class RootSpan extends SpanBaseModel implements OnEndSpanEventListener {
         return this._traceId;
     }
 
-    public getContext(): TraceContext {
-        return <TraceContext>{
-            traceId: this.traceId,
-            spanId: this.id,
-            parentSpanId: this.getParentSpanId
-        }
-    }
-
     public start() {
         super.start()
         debug('starting %s  %o', this._className, { traceId: this.traceId, id: this.id, parentSpanId: this.getParentSpanId() })

packages/opencensus-core/src/trace/types/tracetypes.ts

@@ -160,11 +160,11 @@ export abstract class SpanBaseModel {
     }
 
     public get traceContext(): TraceContext {
-        return {
+        return <TraceContext>{
             traceId: this.traceId.toString(),
             spanId: this.id.toString(),
-            options: 1  // always traced
-        };
+            parentSpanId: this.getParentSpanId
+        }
     }
 
     //TODO: maybe key and values must be truncate