* Add framework-side support for system text scale factor.
* Rolling engine to e3404b81a53ba3180c7623a6f2190ebb28518f30
Additional changes rolled in with engine change:
libtxt: implementation of GetRectsForRange that processes a line at a time - e3404b8
Provide an entropy source to the Dart engine (#4161) - e1aa867
libtxt: search for fallback fonts that can match emoji and CJK characters - 8061df1
Roll skia to e4679fa06a. (#4157) - 267e7a8
Update buildroot to 53fea9aebbcc39c6522731471a1a45960ee0685e (#4160) - 02ea7ae
Revert engine Dart roll. (#4158) - 14aab33
Add support for system text scale factor. (#4124) - b2a7f4b
Include _http into sky_engine libraries for analyzer (#4154) - b930f10
libtxt: Remove postprocess_line and improve tracking of X offsets - 86f95f0
libtxt: remove redundant line_widths (#4152) - 14bf515
Roll dart to ade37f931e90b0fdb8fe16d6bf6f089545da55b6 (#4151) - 6f1264f
* add Android instrumentation test
* add devicelab test
* add to manifest.yaml
* rename _smoke_test.dart to _smoketest.dart to prevent flutter test from picking it up
* volatile fields; style fixes
* use ConditionVariable; fix sh script
* Revert "Update reference to url_launcher plugin in Gallery pubspec (#9879)"
This reverts commit 96a04dea0d2c3a16d4a95fcd931cc00d3a0d2d8d.
* Revert "Revert "Revert plugin use in gallery (#9838)" (#9877)"
This reverts commit ede72a804305e1d8495dfa1e463115ec6d5ad3c6.
* Update hello_world to new gradle based build flow
* Update flutter_gallery to gradle based build
* Align hello_services with new gradle based build
* Update platform_services to new gradle based build
* Upgrade stock to gradle based build
