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* I added the pure virtual function HasVisibleCaretOrSelection() on
AXPlatformNodeDelegate so we can use it in AXPlatformNodeTextProviderWin
without a dynamic cast.

* The default value in the AXPlatformNodeDelegateBase is false.

* The implementation is unchanged, but I moved it with other
AXPlatformNodeDelgate overrides.

Bug: 928948
Change-Id: If80c0a441415cb57ea0b4c352132a4d330fb56d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881993Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Kurt Catti-Schmidt <kschmi@microsoft.com>
Commit-Queue: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#710855}