Revert open-telemetry#3134 - remove anchored clock

packages/opentelemetry-sdk-trace-base/src/Tracer.ts

@@ -15,22 +15,16 @@
  */
 
 import * as api from '@opentelemetry/api';
-import {
-  InstrumentationLibrary,
-  sanitizeAttributes,
-  isTracingSuppressed,
-  AnchoredClock,
-  otperformance,
-} from '@opentelemetry/core';
+import { InstrumentationLibrary, isTracingSuppressed, sanitizeAttributes } from '@opentelemetry/core';
 import { Resource } from '@opentelemetry/resources';
 import { BasicTracerProvider } from './BasicTracerProvider';
+import { IdGenerator } from './IdGenerator';
+import { RandomIdGenerator } from './platform';
+import { Sampler } from './Sampler';
 import { Span } from './Span';
+import { SpanProcessor } from './SpanProcessor';
 import { GeneralLimits, SpanLimits, TracerConfig } from './types';
 import { mergeConfig } from './utility';
-import { SpanProcessor } from './SpanProcessor';
-import { Sampler } from './Sampler';
-import { IdGenerator } from './IdGenerator';
-import { RandomIdGenerator } from './platform';
 
 /**
  * This class represents a basic tracer.
@@ -74,22 +68,10 @@ export class Tracer implements api.Tracer {
       context = api.trace.deleteSpan(context);
     }
     const parentSpan = api.trace.getSpan(context);
-    let clock: AnchoredClock | undefined;
-    if (parentSpan) {
-      clock = (parentSpan as any)['_clock'];
-    }
-
-    if (!clock) {
-      clock = new AnchoredClock(Date, otperformance);
-      if (parentSpan) {
-        (parentSpan as any)['_clock'] = clock;
-      }
-    }
 
     if (isTracingSuppressed(context)) {
       api.diag.debug('Instrumentation suppressed, returning Noop Span');
       const nonRecordingSpan = api.trace.wrapSpanContext(api.INVALID_SPAN_CONTEXT);
-      (nonRecordingSpan as any)['_clock'] = clock;
       return nonRecordingSpan;
     }
 
@@ -134,7 +116,6 @@ export class Tracer implements api.Tracer {
     if (samplingResult.decision === api.SamplingDecision.NOT_RECORD) {
       api.diag.debug('Recording is off, propagating context in a non-recording span');
       const nonRecordingSpan = api.trace.wrapSpanContext(spanContext);
-      (nonRecordingSpan as any)['_clock'] = clock;
       return nonRecordingSpan;
     }
 
@@ -147,7 +128,6 @@ export class Tracer implements api.Tracer {
       parentSpanId,
       links,
       options.startTime,
-      clock,
     );
     // Set initial span attributes. The attributes object may have been mutated
     // by the sampler, so we sanitize the merged attributes before setting them.