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This hardcodes the package IDs of dynamic attributes to 0x2 and throws
an error in WebLayer if the package ID does not end up being 0x2. This
should not affect WebView, since WebView does not depend on any dynamic
attributes.

The *_pb2.py files were generated from the Resources.proto and
Configuration.proto files in the Android frameworks/base repo.

Bug: 1045262
Change-Id: Ic04c150c5c8709f59f738a84068c0b738f0c4643
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018493Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736458}