commit 0ae80a944acd8ad36f26ce500157dd0f1d40d286
author Victor Fei <vicfei@microsoft.com> Tue Sep 07 17:27:32 2021
committer Chromium LUCI CQ <chromium-scoped@luci-project-accounts.iam.gserviceaccount.com> Tue Sep 07 17:27:32 2021
tree bc87e8de9ba536cd55b5d38d64164abb053626a1
parent 85d6b1ee6763e8b761c659551fe00ef66cb25fad

Deprecate old createPreviousFormatStartPosition logic

This change removed old logic for AXPosition
::createPreviousFormatStartPosition and replaced with AXPosition::
CreateBoundaryStartPosition. CreateBoundaryEndPosition is a format
type (word, char, line, paragraph, format) agnostic method to
determine boundary position.

---- Overview of subsequent format position changes ------
The goal of this change is to eventually improve Narrator format
navigation, since currently we don't distinguish between
TextBoundary::kForwardStart\kFormatEnd. In the future, we need to
introduce, ax::mojom::TextBoundary::kFormatStart\kFormatEnd, and
introduce AXPosition::Create*Previous*FormatEndPosition and
AXPosition::Create*Next*FormatStartPosition, so we will have the
following create format methods:
1. When move START endpoint by format (FWD):
    - Create*Next*FormatStartPosition (doesn't exist, needs to impl).
2. When move END endpoint by format (FWD):
    - we call Create*Next*FormatEndPosition (method already exists).
    - Olg logic needs to be deprecated. Addressed in a different CL.
3. When move START endpoint by format (BWD):
    - Create*Previous*FormatStartPosition (already exists)
    - Addressed in this current CL.
4. When move END endpoint by format (BWD):
    - Create*Previous*FormatEnd (doesn't exist, needs to impl).
The above to match the behavior for MoveByLine, Paragraph, and should
improve Narrator format navigation.

Ax-Relnotes: n/a

Change-Id: I7193e65be7d463a24253d8db894be37f70fe4013
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3134740
Commit-Queue: Victor Fei <vicfei@microsoft.com>
Reviewed-by: Daniel Libby <dlibby@microsoft.com>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/main@{#918833}