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Fix a stack overflow that can be caused by receiving a large amount of
data from Chrome. Also increase the maximum buffer size for
communication between app and ChromeDriver.

Bug: chromium:877105, chromedriver:2587, b/112588554
Change-Id: Ie98544237472da629c01b9422b2e01a4716e8b88
Reviewed-on: https://chromium-review.googlesource.com/1233177
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595477}