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This CL adds WebFeature::kClassicDedicatedWorker and
WebFeature::kModuleDedicatedWorker for WorkerOptions#type. These are
recorded in following cases.

(1) When a dedicated worker is constructed using classic scripts,
kClassicDedicatedWorker is recorded:

  const worker1 = new Worker('worker.js');  // or
  const worker2 = new Worker('worker.js', { type: 'classic' });

(2) When a dedicated worker is constructed using module scripts,
kModuleDedicatedWorker is recorded:

  const worker3 = new Worker('worker.js', { type: 'module' });

This CL adds web_tests for these cases.

In addition to that, this CL adds tests for existing kWorkerStart and
kNestedDedicatedWorker. kWorkerStart is recorded when a dedicated worker is
constructed regardless of given options (e.g., 'type') and creator's execution
context. kNestedDedicatedWorker is recorded when a dedicated worker is
constructed from another dedicated worker:

  const worker4 = new Worker('nested-worker.js');

  // In nested-worker.js
  const nested_worker = new Worker('worker.js');

Bug: 680046
Change-Id: Ic8aed3f9f43f6ceafeb5eac4a11382c7a21ea9b7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906855
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714148}