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Add shard maps and disable failing tests for pixel2 devices

This involves updating the shard number in bot_platforms.py and perf_data_generator.py,
and running the following commands to update the json files:

./tools/perf/generate_perf_sharding update \
    --builders android-pixel2-perf \
    --builders android-pixel2_webview-perf
./tools/perf/generate_perf_data

The tag "Pixel2_Webview" in expectations.config will be added in this review: crrev.com/c/1628818

Bug: 867592
Change-Id: I332a5ae8cff1598729775889418f28a67230a82e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628172
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663952}