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The patch adds --sampling-heap-profiler command-line switch that enables
profiler at the renderer process startup.
If the rate is not provided it uses the default sampling interval of 128 KiB.

BUG=803276

Change-Id: I6da0e5fc5083a20b8eec7dc987df6105db24b6d7
Reviewed-on: https://chromium-review.googlesource.com/882604
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532204}