core(tracehouse): merge tracing-processor with trace-of-tab

docs/architecture.md

@@ -39,7 +39,7 @@ driver.sendCommand('Security.enable');
 
 ## Understanding a Trace
 
-`lighthouse-core/lib/tracehouse/trace-of-tab.js` and `lighthouse-core/lib/tracehouse/tracing-processor.js` provide the core transformation of a trace into more meaningful objects. Each raw trace event has a monotonically increasing timestamp in microseconds, a thread ID, a process ID, a duration in microseconds (potentially), and other applicable metadata properties such as the event type, the task name, the frame, etc. [Learn more about trace events](https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview).
+`lighthouse-core/lib/tracehouse/trace-processor.js` provides the core transformation of a trace into more meaningful objects. Each raw trace event has a monotonically increasing timestamp in microseconds, a thread ID, a process ID, a duration in microseconds (potentially), and other applicable metadata properties such as the event type, the task name, the frame, etc. [Learn more about trace events](https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview).
 
 ### Example Trace Event
 ```js

lighthouse-core/computed/metrics/cumulative-long-queuing-delay.js

@@ -8,7 +8,7 @@
 const makeComputedArtifact = require('../computed-artifact.js');
 const ComputedMetric = require('./metric.js');
 const LHError = require('../../lib/lh-error.js');
-const TracingProcessor = require('../../lib/tracehouse/tracing-processor.js');
+const TracingProcessor = require('../../lib/tracehouse/trace-processor.js');
 const LanternCumulativeLongQueuingDelay = require('./lantern-cumulative-long-queuing-delay.js');
 const TimetoInteractive = require('./interactive.js');
 

lighthouse-core/computed/metrics/estimated-input-latency.js

@@ -8,7 +8,7 @@
 const makeComputedArtifact = require('../computed-artifact.js');
 const ComputedMetric = require('./metric.js');
 const LHError = require('../../lib/lh-error.js');
-const TracingProcessor = require('../../lib/tracehouse/tracing-processor.js');
+const TracingProcessor = require('../../lib/tracehouse/trace-processor.js');
 const LanternEstimatedInputLatency = require('./lantern-estimated-input-latency.js');
 
 const ROLLING_WINDOW_SIZE = 5000;

lighthouse-core/computed/metrics/first-cpu-idle.js

@@ -7,7 +7,7 @@
 
 const makeComputedArtifact = require('../computed-artifact.js');
 const ComputedMetric = require('./metric.js');
-const TracingProcessor = require('../../lib/tracehouse/tracing-processor.js');
+const TracingProcessor = require('../../lib/tracehouse/trace-processor.js');
 const LHError = require('../../lib/lh-error.js');
 const LanternFirstCPUIdle = require('./lantern-first-cpu-idle.js');
 

lighthouse-core/computed/metrics/interactive.js

@@ -10,7 +10,7 @@ const ComputedMetric = require('./metric.js');
 const LanternInteractive = require('./lantern-interactive.js');
 
 const NetworkRecorder = require('../../lib/network-recorder.js');
-const TracingProcessor = require('../../lib/tracehouse/tracing-processor.js');
+const TracingProcessor = require('../../lib/tracehouse/trace-processor.js');
 const LHError = require('../../lib/lh-error.js');
 
 const REQUIRED_QUIET_WINDOW = 5000;

lighthouse-core/computed/metrics/max-potential-fid.js

@@ -9,7 +9,7 @@ const makeComputedArtifact = require('../computed-artifact.js');
 const MetricArtifact = require('./metric.js');
 const LanternMaxPotentialFID = require('./lantern-max-potential-fid.js');
 const LHError = require('../../lib/lh-error.js');
-const TracingProcessor = require('../../lib/tracehouse/tracing-processor.js');
+const TracingProcessor = require('../../lib/tracehouse/trace-processor.js');
 
 class MaxPotentialFID extends MetricArtifact {
   /**

lighthouse-core/computed/metrics/metric.js

@@ -5,7 +5,7 @@
  */
 'use strict';
 
-const TracingProcessor = require('../../lib/tracehouse/tracing-processor.js');
+const TracingProcessor = require('../../lib/tracehouse/trace-processor.js');
 const TraceOfTab = require('../trace-of-tab.js');
 const NetworkRecords = require('../network-records.js');
 

lighthouse-core/computed/page-dependency-graph.js

@@ -9,7 +9,7 @@ const makeComputedArtifact = require('./computed-artifact.js');
 const NetworkNode = require('../lib/dependency-graph/network-node.js');
 const CPUNode = require('../lib/dependency-graph/cpu-node.js');
 const NetworkAnalyzer = require('../lib/dependency-graph/simulator/network-analyzer.js');
-const TracingProcessor = require('../lib/tracehouse/tracing-processor.js');
+const TracingProcessor = require('../lib/tracehouse/trace-processor.js');
 const NetworkRequest = require('../lib/network-request.js');
 const TraceOfTab = require('./trace-of-tab.js');
 const NetworkRecords = require('./network-records.js');

lighthouse-core/computed/trace-of-tab.js

@@ -6,7 +6,34 @@
 'use strict';
 
 const makeComputedArtifact = require('./computed-artifact.js');
-const TraceOfTab_ = require('../lib/tracehouse/trace-of-tab.js');
+const LHError = require('../lib/lh-error.js');
+const TraceProcessor = require('../lib/tracehouse/trace-processor.js');
+
+// TraceProcessor throws generic errors, but we'd like our special localized and code-specific LHError
+// objects to be thrown instead.
+class LHTraceProcessor extends TraceProcessor {
+  /**
+   * @return {Error}
+   */
+  static createNoNavstartError() {
+    return new LHError(LHError.errors.NO_NAVSTART);
+  }
+
+  /**
+   * @return {Error}
+   */
+  static createNoFirstContentfulPaintError() {
+    return new LHError(LHError.errors.NO_FCP);
+  }
+
+  /**
+   * @return {Error}
+   */
+  static createNoTracingStartedError() {
+    return new LHError(LHError.errors.NO_TRACING_STARTED);
+  }
+}
+
 
 class TraceOfTab {
   /**
@@ -16,7 +43,7 @@ class TraceOfTab {
    * @return {Promise<LH.Artifacts.TraceOfTab>}
   */
   static async compute_(trace) {
-    return TraceOfTab_.compute(trace);
+    return LHTraceProcessor.computeTraceOfTab(trace);
   }
 }
 

lighthouse-core/lib/minify-trace.js

@@ -12,11 +12,10 @@
  *  See the following files for necessary events:
  *    - lighthouse-core/computed/page-dependency-graph.js
  *    - lighthouse-core/lib/dependency-graph/cpu-node.js
- *    - lighthouse-core/lib/tracehouse/trace-of-tab.js
- *    - lighthouse-core/lib/tracehouse/tracing-processor.js
+ *    - lighthouse-core/lib/tracehouse/trace-processor.js
  */
 
-const TracingProcessor = require('./tracehouse/tracing-processor.js');
+const TracingProcessor = require('./tracehouse/trace-processor.js');
 
 const toplevelTaskNames = new Set([
   'RunTask', // m71+