Add "Dotum" to the noSubpixelForSmallSizeFont black list

Add "Dotum" to the noSubpixelForSmallSizeFont black list

This patch disables kSubpixelPositioning_Flag for "Dotum" in small
sizes.

The embedded bitmap of "Dotum" font looks poorly positioned when linear
metrics is used. This patch improves the positioning of the font by
disabling linear metrics.

Skia disables linear metrics and use DWRITE_MEASURING_MODE_GDI_CLASSIC
when kEmbeddedBitmapText_Flag & the font has 'eblc' OpenType table for
the specified size & !kSubpixelPositioning_Flag. The first two
conditions are already true, this patch turns the last condition to
true.

BUG=394585
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=201515

[kojii, 2015-08-30 13:55:48]

kojii@chromium.org changed reviewers:
+ drott@chromium.org, eae@chromium.org

[kojii, 2015-08-30 14:01:49]

PTAL.

Please also refer to http://crbug.com/394585#c46 for further details.

[eae, 2015-08-31 17:39:01]

https://codereview.chromium.org/1304363011/diff/1/Source/platform/fonts/win/F...
File Source/platform/fonts/win/FontCacheSkiaWin.cpp (right):

https://codereview.chromium.org/1304363011/diff/1/Source/platform/fonts/win/F...
Source/platform/fonts/win/FontCacheSkiaWin.cpp:406: L"dotum",
You might want to remove it from the minAntiAliasSizeForFont list above.

[eae, 2015-08-31 17:39:25]

LGTM

[kojii, 2015-09-01 00:56:50]

The CQ bit was checked by kojii@chromium.org

[commit-bot: I haz the power, 2015-09-01 00:57:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304363011/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304363011/1

[commit-bot: I haz the power, 2015-09-01 02:25:10]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201515