…alls (flutter/engine#48571)

…alls (flutter/engine#48571)

…alls (flutter/engine#48571)

…alls (flutter/engine#48571)

…alls (flutter/engine#48571)

…alls (flutter/engine#48571)

…alls (flutter/engine#48571)

…ls (flutter#48571)"

This reverts commit ab89510.

The flutter/tests/skp_generator test (running in flutter_tester on Linux)
was failing, along with some customer tests.

…alls (flutter/engine#48571)

…alls (flutter/engine#48571)

…ter#48571)

In https://g-issues.skia.org/issues/305780908 Skia is removing the
default SkFontMgr. Previous work consolidated all references to
txt/platform.h and this replaces those last references. I attempted to
mirror the existing functionality, which still responds to GN flags and
the target platform.

After this PR, Flutter should not be depending on the default fontmgr
(and the defines in flutter_defines.gni) will maintain that behavior
until the legacy functions/methods are deleted from Skia. There were a
few tests that I missed on an earlier PR which relied on the default
font (helper added in flutter#47493). These tests were failing because they
were making some assertions related to TextBlobs, which didn't work if
the (now-empty) Typeface they loaded had no glyphs. Thus, I added a few
extra asserts to make sure these textblobs *had* glyphs which make the
failing tests less mysterious, should this issue crop up again.

I cleaned up Flutter's BUILD.gn file for Skia a bit, deleting unused
targets related to the font managers. This involved fixing an implicit
dependency from //third_party/glfw/ to `Gdi32.lib` on Windows.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide] and the [C++,
Objective-C, Java style guides].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I added new tests to check the change I am making or feature I am
adding, or the PR is [test-exempt]. See [testing the engine] for
instructions on writing and running engine tests.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [x] I signed the [CLA].
- [x] All existing and new tests are passing.

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…alls (flutter/engine#48571)

…ls" (#48764)

Relands #48571 with a patch that uses the directory-based SkFontMgr as a default font manager on Linux

…139716)

flutter/engine@347f506...82de334

2023-12-07 [email protected] Revert "Replace use of Fontmgr::RefDefault with explicit creation calls" (flutter/engine#48755)
2023-12-07 [email protected] Roll Skia from 2abb01e18ab3 to 8ebf43ba1c09 (1 revision) (flutter/engine#48761)
2023-12-07 [email protected] Roll Dart SDK from dbfe4e3f867e to be8a95b6717d (1 revision) (flutter/engine#48757)
2023-12-06 [email protected] Remove obsolete properties. (flutter/engine#48753)
2023-12-06 [email protected] Roll Skia from 7ff0103760d0 to 2abb01e18ab3 (1 revision) (flutter/engine#48751)
2023-12-06 [email protected] Roll Skia from 570103e08087 to 7ff0103760d0 (1 revision) (flutter/engine#48748)
2023-12-06 [email protected] Roll Skia from 326bdc97ac40 to 570103e08087 (1 revision) (flutter/engine#48746)
2023-12-06 [email protected] Roll Dart SDK from 6eb13603c212 to dbfe4e3f867e (1 revision) (flutter/engine#48745)
2023-12-06 [email protected] [Impeller] Store Buffer/Texture bindings in vector instead of map. (flutter/engine#48719)
2023-12-06 [email protected] Roll Skia from 33cba437bf70 to 326bdc97ac40 (2 revisions) (flutter/engine#48743)
2023-12-06 [email protected] [Impeller] Provide the clear color to an advanced blend if it was optimized out (flutter/engine#48646)
2023-12-06 [email protected] [Windows] Set swap interval on raster thread after startup (flutter/engine#47787)
2023-12-06 [email protected] Roll Skia from 384d14063dc1 to 33cba437bf70 (3 revisions) (flutter/engine#48740)
2023-12-06 [email protected] [Windows] Refactor the GLES proc table (flutter/engine#48688)
2023-12-06 [email protected] Replace use of Fontmgr::RefDefault with explicit creation calls (flutter/engine#48571)
2023-12-06 [email protected] [Impeller] disable entity culling by default. (flutter/engine#48717)
2023-12-06 [email protected] Roll Skia from 23e1cb20a6b5 to 384d14063dc1 (1 revision) (flutter/engine#48738)

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