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This changelist includes the following fixes for virtual views:

- Ensures that virtual view accessible bounds are provided for
  |TreeView| nodes when requested. PopulateAccessibilityData() is
  responsible for providing the values, but it was being bypassed in
  GetBoundsRect() and HitTestSync(), which were accessing
  |custom_data_| instead of calling GetData().

- Converts the virtual view accessible bounds to device pixels by
  scaling it by the device scale factor.

- Makes virtual view accessible bounds robust to changes in the owner
  view's bounds in screen. This can happen if the host window was moved
  or resized.

Bug: 811277
Change-Id: Icb9379e635e8c09d299a9022f24714f32ffed150
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129987Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Brian Liu Xu <brx@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#757448}