The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8fd9860a37236d0d424b33e344f71df12625a653

commit 8fd9860a37236d0d424b33e344f71df12625a653
Author: eae <eae@chromium.org>
Date: Thu Feb 09 00:30:23 2017

Add support for shaping a substring to HarfBuzzShaper

Add support to HarfBuzzShaper for shaping a portion of the supplied text
content as identified by a start and end offset. This allows an instance
of the shaper to be used to shape multiple portions, or segments, of the
string with different fonts, styles and font feature settings as needed.

This change also renames a couple of methods and fields to increase code
readability and to avoid confusion. Significant renames described below:

                           shapeResult() -> shape()
                          harfBuzzBuffer -> buffer
                        normalizedBuffer -> text
                  normalizedBufferLength -> textLength

Eventually this will also allow for context aware shaping by passing the
surrounding text as context to harfbuzz when invoking shaping algorithm.

TEST=Source/platform/fonts/shaping/HarfBuzzShaperTest.cpp
BUG= 689155 
R=drott@chromium.org

Review-Url: https://codereview.chromium.org/2686503003
Cr-Commit-Position: refs/heads/master@{#449158}

[modify] https://crrev.com/8fd9860a37236d0d424b33e344f71df12625a653/third_party/WebKit/Source/platform/fonts/shaping/CachingWordShapeIterator.cpp
[modify] https://crrev.com/8fd9860a37236d0d424b33e344f71df12625a653/third_party/WebKit/Source/platform/fonts/shaping/HarfBuzzShaper.cpp
[modify] https://crrev.com/8fd9860a37236d0d424b33e344f71df12625a653/third_party/WebKit/Source/platform/fonts/shaping/HarfBuzzShaper.h
[modify] https://crrev.com/8fd9860a37236d0d424b33e344f71df12625a653/third_party/WebKit/Source/platform/fonts/shaping/HarfBuzzShaperTest.cpp
[modify] https://crrev.com/8fd9860a37236d0d424b33e344f71df12625a653/third_party/WebKit/Source/platform/fonts/shaping/RunSegmenter.cpp
[modify] https://crrev.com/8fd9860a37236d0d424b33e344f71df12625a653/third_party/WebKit/Source/platform/fonts/shaping/RunSegmenter.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3d591708efa7d967c4158fc03369a2bf11aeacc2

commit 3d591708efa7d967c4158fc03369a2bf11aeacc2
Author: eae <eae@chromium.org>
Date: Sat Feb 18 18:11:37 2017

[LayoutNG] Shape items with context

Change the inline-layout shaping approach in LayoutNG to shape each item
with the full contetx of the NGInlineNode.

BUG= 689155 
R=kojii@chromium.org

Review-Url: https://codereview.chromium.org/2702853002
Cr-Commit-Position: refs/heads/master@{#451478}

[modify] https://crrev.com/3d591708efa7d967c4158fc03369a2bf11aeacc2/third_party/WebKit/Source/core/layout/ng/ng_inline_node.cc
[modify] https://crrev.com/3d591708efa7d967c4158fc03369a2bf11aeacc2/third_party/WebKit/Source/core/layout/ng/ng_inline_node.h
[modify] https://crrev.com/3d591708efa7d967c4158fc03369a2bf11aeacc2/third_party/WebKit/Source/platform/fonts/shaping/ShapeResultBuffer.cpp
[modify] https://crrev.com/3d591708efa7d967c4158fc03369a2bf11aeacc2/third_party/WebKit/Source/platform/fonts/shaping/ShapeResultBuffer.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/84d8af49b69b6ab89bde2d657b96c5f280fd439c

commit 84d8af49b69b6ab89bde2d657b96c5f280fd439c
Author: kojii <kojii@chromium.org>
Date: Tue May 09 17:38:05 2017

Clamp RunInfo::num_characters when shaping ranges with context

HarfBuzzShaper::ShapeSegment clamps ShapeResult::num_characters but
RunInfo::num_characters was not clamped.

This patch applies the same clamping to RunInfo::num_characters.

BUG= 689155 

Review-Url: https://codereview.chromium.org/2869893005
Cr-Commit-Position: refs/heads/master@{#470371}

[modify] https://crrev.com/84d8af49b69b6ab89bde2d657b96c5f280fd439c/third_party/WebKit/Source/platform/fonts/shaping/HarfBuzzShaper.cpp
[modify] https://crrev.com/84d8af49b69b6ab89bde2d657b96c5f280fd439c/third_party/WebKit/Source/platform/fonts/shaping/HarfBuzzShaperTest.cpp
[modify] https://crrev.com/84d8af49b69b6ab89bde2d657b96c5f280fd439c/third_party/WebKit/Source/platform/fonts/shaping/ShapeResultTestInfo.cpp
[modify] https://crrev.com/84d8af49b69b6ab89bde2d657b96c5f280fd439c/third_party/WebKit/Source/platform/fonts/shaping/ShapeResultTestInfo.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3b352efa15e478d022b40fa38e64f90a7b86fc59

commit 3b352efa15e478d022b40fa38e64f90a7b86fc59
Author: Dominik Röttsches <drott@chromium.org>
Date: Mon Aug 13 16:35:05 2018

Run more HarfBuzzShaperTests

SafeToBreakMissingRun was a Mac only failure,
SafeToBreakArabicCommonLigatures were Mac and Android only failures,
ShapeArabicWithContext was waiting for range shaping to be implemented,
which had been fixed in the meantime for non-Mac..

Bug:  689155 , 870712
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I5ce017be3417ef24720cfb5a9818384ebd148b6c
Reviewed-on: https://chromium-review.googlesource.com/1162177
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582607}
[modify] https://crrev.com/3b352efa15e478d022b40fa38e64f90a7b86fc59/third_party/blink/renderer/platform/fonts/shaping/harfbuzz_shaper_test.cc