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Currently, nothing in the codebase exists to generate java heap dumps.

By adding this, we write heap dumps to file that can be passed to c++
which can be later uploaded and analyzed.

Bug: 1012072

Change-Id: I9381b998d3fc98d2efa7f226e3c0b0b25dd4f3ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839011
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706077}