The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/666e4f0298298427d2026c2896466951f199f5bf

commit 666e4f0298298427d2026c2896466951f199f5bf
Author: karandeepb <karandeepb@chromium.org>
Date: Mon Jan 23 01:57:27 2017

MacViews: Enable word lookup for selectable views::Labels and multi-line text.

r423419 added support for word lookups to textfields on MacViews and r441290
added support for multi-line text selection to RenderTextHarfBuzz. This CL
enables word lookup for selectable views::Labels. Changes:
  - Made views::Label inherit from WordLookupClient.
  - Moved GetLineContainingYCoord and GetLineSegmentContainingXCoord from
    RenderTextHarfBuzz to the base RenderText class.
  - Added multi-line support to RenderText::GetDecoratedWordAtPoint.

BUG= 640502 , 671055 

TEST=Run out/Default/views_examples_with_content_exe with the flag --enable-
harfbuzz-rendertext. Go to the Label section. Ensure word lookup works correctly
on pressing Ctrl+Command+D for selectable labels.

Review-Url: https://codereview.chromium.org/2639493002
Cr-Commit-Position: refs/heads/master@{#445313}

[modify] https://crrev.com/666e4f0298298427d2026c2896466951f199f5bf/ui/gfx/render_text.cc
[modify] https://crrev.com/666e4f0298298427d2026c2896466951f199f5bf/ui/gfx/render_text.h
[modify] https://crrev.com/666e4f0298298427d2026c2896466951f199f5bf/ui/gfx/render_text_harfbuzz.cc
[modify] https://crrev.com/666e4f0298298427d2026c2896466951f199f5bf/ui/gfx/render_text_harfbuzz.h
[modify] https://crrev.com/666e4f0298298427d2026c2896466951f199f5bf/ui/gfx/render_text_unittest.cc
[modify] https://crrev.com/666e4f0298298427d2026c2896466951f199f5bf/ui/views/controls/label.cc
[modify] https://crrev.com/666e4f0298298427d2026c2896466951f199f5bf/ui/views/controls/label.h