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This function will allow QuotaManager to identify the state of
storage pressure when given information about disk capacity and usage.
QuotaManager will ultimately use this signal to dispatch a storage pressure event to script.

This change also moves the kStoragePressureEvent flag from content_features to quota_features so that it can be accessed from quota code, and content can never be included in storage.
This flag will remain accessible from content.

Design Doc: https://docs.google.com/document/d/1-ZzFe7ITnzW-G7uymhv_obPwfQjJwzA6wh10tfl5tCw/edit

Bug: 1088004
Change-Id: I84387f0599dde3404ffbae9014bf389bd0039ba0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252032
Commit-Queue: Lexi Stavrakos <astavrakos@google.com>
Reviewed-by: Jarryd Goodman <jarrydg@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790575}