GitLab

1. Adding a method in `AXPlatformNodeDelegate` to provide a localized
   string for the Landmark Type property of an element.

   A cross-platform browser test to validate such method is created.

2. Introducing support in `AXPlatformNodeWin::GetPropertyValue` for UIA
   Landmark Type and Localized Landmark Type properties.

3. Adding unit tests for both properties in `AXPlatformNodeWinTest`.

4. Updating role mapping for Windows and Linux platforms to be more
   consistent with the CORE-AMM specification.

   See: https://www.w3.org/TR/html-aam-1.0/#html-element-role-mappings
        https://www.w3.org/TR/core-aam-1.2/#mapping_role_table

Bug: 844149
Change-Id: I7a2f47ff6b7b127907b8bfff63ae84852e153f1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509907
Commit-Queue: Ethan Jimenez <ethavar@microsoft.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Martin Robinson <mrobinson@igalia.com>
Cr-Commit-Position: refs/heads/master@{#642362}