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This adds a new third_party directory, android_data_chart, which
contains the data usage chart UI widget from Android's Settings app. The
widget shows a graph of how much data the user has used and saved over
time.

BUG=428885
R=bengr@chromium.org, cpu@chromium.org, dannyb@google.com, tedchoc@chromium.org

Review URL: https://codereview.chromium.org/866813004

Cr-Commit-Position: refs/heads/master@{#314251}