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A new web API called performance.measureMemory is implemented using
PerformanceManager. Since web platform tests run in a content_shell,
we need to add and enable PerformanceManager there.

This CL is based on a patch by Joe Mason.

Bug: 1085129
Change-Id: Iefeafbd7a12245d4ca246f3ee28dc3e5292d37e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426587
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812089}