This reverts commit 1e36d440.

* 94f5cf4b1 Roll Dart SDK from 1a1ab78dd6bc to 91e46dcbbbbd (4 revisions) (flutter/engine#20431)

* e0d515369 Make CkVertices a ManagedSkiaObject (flutter/engine#20421)

* 5161fd1a6 Roll Skia from 864562faf497 to b3f26441d191 (22 revisions) (flutter/engine#20447)

* 2ac5b3460 Revert "Refactor initial route code (#19684)" (flutter/engine#20450)

* 5c8a62608 Delete CSS paint code (flutter/engine#20426)

* 9f146b5f4 Add --unoptimied and --asan to Fuchsia builds (flutter/engine#20427)

* 4fb3ea81a Roll Dart SDK from 91e46dcbbbbd to abdfa80162c1 (3 revisions) (flutter/engine#20453)

* 4e2178742 Roll Skia from b3f26441d191 to c95b589112f3 (12 revisions) (flutter/engine#20456)

* d49c94b6e Roll Fuchsia Mac SDK from us_8V5gGK... to ik9kEVW-J... (flutter/engine#20457)

* 2eebe4a94 Roll Fuchsia Linux SDK from vomfYvIJk... to xcu8qvX33... (flutter/engine#20458)

* debb30edd Fix broken symbols on Fuchsia embedder (flutter/engine#20459)

* 2bc0bfdab Send locale information in the macOS embedding (flutter/engine#20461)

* 651cb384a Roll Skia from c95b589112f3 to 652124c372e5 (4 revisions) (flutter/engine#20462)

* 95b2ebfaf Roll Dart SDK from abdfa80162c1 to 279a4b920da8 (1 revision) (flutter/engine#20463)

* de6810b6a Roll Skia from 652124c372e5 to 025843fad003 (1 revision) (flutter/engine#20467)

* 52c1ec6a2 Roll Dart SDK from 279a4b920da8 to 00016747ab48 (2 revisions) (flutter/engine#20471)

* 7d45e22ea Roll Dart SDK from 00016747ab48 to 9ae3e22f1e53 (1 revision) (flutter/engine#20474)

* aa4601156 Roll Fuchsia Mac SDK from ik9kEVW-J... to c9oMk4qlD... (flutter/engine#20476)

* 4746a93ae Roll Skia from 025843fad003 to df9ed89229db (4 revisions) (flutter/engine#20478)

* dd2c5a1b8 Plumbing for setting domain network policy (flutter/engine#20218)

* f0955b071 Roll Fuchsia Linux SDK from xcu8qvX33... to AjjDqKkUV... (flutter/engine#20477)

* eef639ca2 Roll Skia from df9ed89229db to 8dd1e22f4130 (2 revisions) (flutter/engine#20481)

* f1855fb5a Clean-up CanvasKit canvas sizing. (flutter/engine#20387)

* d9f00a38a Roll Skia from 8dd1e22f4130 to af36652766db (6 revisions) (flutter/engine#20484)

* 4a91bc8de Roll Dart SDK from 9ae3e22f1e53 to 6d15e04622c2 (1 revision) (flutter/engine#20483)

* f3964186c Do not access members after calling ClearDartWrapper (flutter/engine#20465)

* dacd2d435 Roll Skia from af36652766db to cc01311cfc96 (4 revisions) (flutter/engine#20485)

* 9cd99d265 Add enabled flag for try builders (flutter/engine#20460)

* 0c504da03 Refactor initial route code take 2 (flutter/engine#20468)

* 6d44559b7 Remove the dummy rasterizer delegate now that flutter_runner is in tree, and cleanup ctor params (flutter/engine#20486)

* 16c328d12 Roll Skia from cc01311cfc96 to 9e77f20864d3 (6 revisions) (flutter/engine#20489)

* da3c9ff53 Fix unoptimized fuchsia builds (flutter/engine#20488)

* 9e3038371 Roll Skia from 9e77f20864d3 to 311dd9d8474c (4 revisions) (flutter/engine#20493)

* f644d0350 Add a service protocol for raster cache memory (flutter/engine#20466)

* 6685b3195 Roll Skia from 311dd9d8474c to 283c230fa18a (2 revisions) (flutter/engine#20499)

* d6052c001 Roll Fuchsia Linux SDK from AjjDqKkUV... to -dcNYnqRy... (flutter/engine#20502)

* 022058f7e Roll Fuchsia Mac SDK from c9oMk4qlD... to B75vjVVwe... (flutter/engine#20504)

* 9c99bf758 Add missing nullable annotation (flutter/engine#20505)

* d4f610065 Roll Skia from 283c230fa18a to b6ce6baf7a7a (1 revision) (flutter/engine#20506)

* 84aa36568 Fix the legacy EncodableValue codepaths (flutter/engine#20501)

* c3d03b7ad Roll Skia from b6ce6baf7a7a to c184cf36092f (3 revisions) (flutter/engine#20507)

* 5aaebfcff Roll Skia from c184cf36092f to 1cf2c8d6ec21 (1 revision) (flutter/engine#20509)

* 4899b1c69 Roll Skia from 1cf2c8d6ec21 to e219c7ed3754 (1 revision) (flutter/engine#20512)

* 0d83051b1 Roll Skia from e219c7ed3754 to c9c4e2e9efac (3 revisions) (flutter/engine#20513)

* 33015c6c7 hasStrings on Android (flutter/engine#20393)

* 7b1ee9fdf Roll Skia from c9c4e2e9efac to 166cd52cee64 (4 revisions) (flutter/engine#20515)

* b32a2a5b0 Make sure ios tests fail if they fail (flutter/engine#20518)

* 0cda2931e Fixed the accessibility ios unit tests by sending in mock view (flutter/engine#20522)

* 999322825 Fix web_ui warnings flagged by the next Dart analyzer update (flutter/engine#20524)

* 169b22cda Handle glfwGetPrimaryMonitor returning nullptr (flutter/engine#20523)

* 429675d31 Custom Gradle home and add .vpython file (flutter/engine#20425)

* 9333b7c1d Create PlatformView instance right after method channel call from Dart (flutter/engine#20500)

* f0ca3d29a Roll Fuchsia Linux SDK from -dcNYnqRy... to WXwJgZ7tK... (flutter/engine#20517)

* dbf7e8311 Roll Skia from 166cd52cee64 to 01d016186340 (9 revisions) (flutter/engine#20519)

* 5a2bf6aa4 Reland: "fuchsia: Remove dead code / break dependencies" (flutter/engine#20532)

* 1590fb23c Roll Fuchsia Mac SDK from B75vjVVwe... to tmHY285qa... (flutter/engine#20534)

* f60e83696 Started stubbing in the FlutterView property of the mock (flutter/engine#20542)

* ac6442a65 Roll Fuchsia Linux SDK from WXwJgZ7tK... to t6BpwE-Ie... (flutter/engine#20539)

* 7d4b549eb Roll Fuchsia Mac SDK from tmHY285qa... to 0ZIOLxuHh... (flutter/engine#20544)

* b300be3df Roll Dart SDK from 6d15e04622c2 to 302893b93170 (11 revisions) (flutter/engine#20545)

* 31a0e45eb Roll Skia from 01d016186340 to a008b0fa8bbb (14 revisions) (flutter/engine#20546)

* ac8175fee Only create raster_thread_merge when explicitly requested by the embedding platform (flutter/engine#20487)

* 8430fa1e6 Roll Fuchsia Linux SDK from t6BpwE-Ie... to TD-QSKxG8... (flutter/engine#20548)

* ddf253b4c Roll Fuchsia Mac SDK from 0ZIOLxuHh... to EEj2OHioI... (flutter/engine#20549)

* 7fa21a45a [windows] Expose the binary messenger from FlutterEngine (flutter/engine#20399)

* 3ebcde6a1 Revert "[windows] Expose the binary messenger from FlutterEngine (#20399)" (flutter/engine#20550)

* 3aff25692 Enable iOS plumbing for network security and add tests (flutter/engine#20492)

* f74e4277d Roll Dart SDK from 302893b93170 to 58a209093c38 (1 revision) (flutter/engine#20552)

* fb581b989 Roll Skia from a008b0fa8bbb to d882e93e416b (2 revisions) (flutter/engine#20553)

* 219fc839e Roll Skia from d882e93e416b to c4245f475be7 (2 revisions) (flutter/engine#20554)

* 2116ed2e1 Roll Fuchsia Mac SDK from EEj2OHioI... to ko0N4Pxl_... (flutter/engine#20555)

* 76d492229 Roll Fuchsia Linux SDK from TD-QSKxG8... to oNnqaiRXK... (flutter/engine#20556)

* 32b1b70e2 [windows] Expose the binary messenger from FlutterEngine (flutter/engine#20551)

* 9060913dc Send locale information in the Windows embedding (flutter/engine#20455)

* d7510dffa Roll Dart SDK from 58a209093c38 to e74e4de7a430 (1 revision) (flutter/engine#20559)

* 613be923b Roll Skia from c4245f475be7 to fdbd50a8dc87 (4 revisions) (flutter/engine#20561)

This reverts commit b2c0970a.

This reverts commit b1c17313.

Prevent viewport.showOnScreen from scrolling the viewport if the specified Rect is already visible.  (#56413)

* report failure for semantics test

* bug fix

Now that https://github.com/dart-lang/sdk/issues/41985 is fixed, the
analyzer detects dead code due to "unnecessary" null checks.  Since we
want to retain null checks in Flutter even when they appear
unnecessary (in order to preserve runtime behavior in weak mode), we
need to suppress these dead code hints.

Note that one assertion is removed by this PR (`heightFactor != null
|| (heightFactor == 1.0 && heightDelta == 0.0)`).  This is because
`heightFactor == 1.0 && heightDelta == 0.0` can only be true if
`heightFactor != null`, so this assertion is equivalent to simply
asserting that `heightFactor != null`, which is already asserted two
lines above.

* add enabled flag

* remove flaky flag for try builders

* remove trailing space