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This change adds --type=evaluate_capability command line parameter to execute
host binary in "evaluate capability" mode. Meanwhile a helper function
int EvaluateCapabilityForkedly() has been added to execute the host binary to
evaluate certain functionality, and retrieves its output.

Return value is too simple for the evaluation, e.g. for DirectX capturer, both
initialization result and DirectX version are required. To make it simple, in a
coming change, we can directly output the host attributes regarding to the
DirectX capturer into console, so the network process needs not to execute any
DirectX related logic.

Bug: 741926
Change-Id: Ief06bed7b9297318bd387106108eccd02180e066
Reviewed-on: https://chromium-review.googlesource.com/575730
Commit-Queue: Zijie He <zijiehe@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490121}