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Add perf tests to cover more Cache Storage APIs and also extend
WorkerTestHelper to support measuring time in worker.

All the Cache Storage perf tests cost 33 seconds on a machine:
CPU: Intel Core i7-4790 @ 3.6 GHZ
RAM: 32G

Design doc: https://docs.google.com/document/d/1bGBWHAsIsrQ0hrjU7oEVAcGSBS9gFSPcDL9nVWXDeeE/edit

Bug: 1019097
Change-Id: I0c5adb9524d75dd8a7d84e10a14ef55a3b941473
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2008191
Commit-Queue: Ting Shao <ting.shao@intel.com>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748109}