Updates the platform shims in dev/manual_tests so that Windows and Linux can be built. I had to update the Windows shims, because I was unable to build a Windows app there.
Also updates the analyze.dart script to report all license issues simultaneously instead of just dying after the first failure.
The only substantive code changes are in dev/bots/analyze.dart and dev/bots/test/analyze_test.dart
* 1f60bfcbb Fix missing shcore.dll error on Windows 7 (flutter/engine#30699)
* 4c303676d Roll Fuchsia Mac SDK from G04Sc3__F... to WjrtT4DAB... (flutter/engine#30700)
* 2bf6b01be Migrate keyboard_key_handler_unittests to keyboard_win32_unittests (flutter/engine#30615)
* ed6868f7b Update //third_party/glfw from Aug 2016 to Jan 2019 (revision 78e6a006) (flutter/engine#30609)
* 7fae72abc Roll Skia from 88c5af7ecd72 to 8e6b60f27da3 (3 revisions) (flutter/engine#30703)
* b01a5a938 Roll Fuchsia Mac SDK from WjrtT4DAB... to fSRFvvC1c... (flutter/engine#30705)
* 63f9190a4 Roll Skia from 8e6b60f27da3 to f5853ff6525b (1 revision) (flutter/engine#30706)
* 7467eac56 Roll Skia from f5853ff6525b to db2b8eb98f14 (1 revision) (flutter/engine#30708)
* 936c3a0a2 Roll Skia from db2b8eb98f14 to 426f7b5ad606 (2 revisions) (flutter/engine#30710)
* 9524ec80f Roll Skia from 426f7b5ad606 to a5d4541ae556 (3 revisions) (flutter/engine#30712)
* e8bb6866b Roll Skia from a5d4541ae556 to 96e4053be7a5 (3 revisions) (flutter/engine#30714)
* d301340f5 Roll Skia from 96e4053be7a5 to ce49ff6520fa (4 revisions) (flutter/engine#30715)
* 38a007d12 Roll Dart SDK from f59531cc2973 to 5f2c54513b7d (13 revisions) (flutter/engine#30716)
* 305dcd5a2 Roll Skia from ce49ff6520fa to 73657689b6cb (5 revisions) (flutter/engine#30718)
* d930dce5b [web] allow customizing Ahem URL using FontManifest.json (flutter/engine#30719)
* a0bbfeb83 Roll Skia from 73657689b6cb to 72412a86725a (3 revisions) (flutter/engine#30721)
* d53b3c247 Fix aot builds in the dart_runner for fuchsia (flutter/engine#30722)
* 56816a0ba Roll Skia from 72412a86725a to 2f3891bf76f3 (1 revision) (flutter/engine#30723)
* 496e05526 Roll Dart SDK from 5f2c54513b7d to 8a8fb0972646 (1 revision) (flutter/engine#30725)
* 685d2208e Bump Robolectric to 4.7.3 (flutter/engine#30437)
* f8a8276f9 Roll Fuchsia Mac SDK from fSRFvvC1c... to cSwk_StnQ... (flutter/engine#30727)
* 594238c30 Revert Dart SDK to f59531cc2973 (flutter/engine#30729)
* 9481a7959 Roll Skia from 45f64bd52835 to 6bebf036a502 (2 revisions) (flutter/engine#30659)
* fb4a86ce1 Roll Fuchsia Mac SDK from RyUwCnr_M... to vpa6vKu7U... (flutter/engine#30661)
* 154bd9686 Roll Skia from 6bebf036a502 to 5726d457cf15 (1 revision) (flutter/engine#30665)
* ba23c6c10 Roll Skia from 5726d457cf15 to 61d0fbbca795 (5 revisions) (flutter/engine#30673)
* e749ba31a Impl and test (flutter/engine#30488)
* a78103cc9 Removed "UiThread" annotation from MethodChannel#Result. (flutter/engine#30671)
* f8a398f03 Fix crash in BackdropFilterLayer::Diff (flutter/engine#30460)
* a6a856f34 Only provide frame damage to rasterizer if partial repaint is enabled (flutter/engine#30461)
* 3a667abc1 Roll Fuchsia Mac SDK from vpa6vKu7U... to Al-HXHXyQ... (flutter/engine#30677)
* 830abebe3 [web] roll CanvasKit 0.32.0; fix frame order in animated images (flutter/engine#30680)
* c7261216d Add a new display_list_benchmarks test suite (flutter/engine#30678)
* f181c4df6 [web] flip browser image codec flag to opt-out (flutter/engine#30681)
* 436a346dd Remove the ios_tools Chromium-style dependency (flutter/engine#30538)
* 3f63998c1 [web] bring libraries.yaml/libraries.json up to date (flutter/engine#30467)
* ab1e8f5b7 Roll Skia from 61d0fbbca795 to 4981c921c6d7 (1 revision) (flutter/engine#30684)
* 8e4124b7f Roll Skia from 4981c921c6d7 to d7771857e9e2 (2 revisions) (flutter/engine#30685)
* acb60b4b8 Roll Fuchsia Mac SDK from Al-HXHXyQ... to G04Sc3__F... (flutter/engine#30687)
* 017629531 [Win32, Keyboard] TextInputPlugin is no longer a KeyboardHandlerBase (flutter/engine#30456)
* bcb4b359b Roll Skia from d7771857e9e2 to ec2e8f11b97a (1 revision) (flutter/engine#30688)
* e09f8d18a Roll Dart SDK from 1697706df708 to ab5047720a9e (5 revisions) (flutter/engine#30690)
* d60c81697 Roll Dart SDK from 1697706df708 to f59531cc2973 (10 revisions) (flutter/engine#30691)
* 417042cb3 GN targets for generating release artifacts (flutter/engine#30679)
* 7f3101521 Roll Skia from ec2e8f11b97a to 84d6cf9b5b76 (7 revisions) (flutter/engine#30693)
* fed9e0b71 Roll Skia from 84d6cf9b5b76 to 88c5af7ecd72 (3 revisions) (flutter/engine#30695)
* 36eafae59 [fuchsia][shader warmup] fix for fxbug.dev/90387 (flutter/engine#30482)
* 0c036a77a Revert "Only provide frame damage to rasterizer if partial repaint is enabled (#30461)" (flutter/engine#30696)
* 849877954 [fuchsia] Fix failing SDK roll. (flutter/engine#30675)
* Building shared C source code as part of the native build for platforms Android, iOS, Linux desktop, MacOS desktop, and Windows desktop.
* Sample code doing a synchronous FFI call.
* Sample code doing a long running synchronous FFI call on a helper isolate.
* Use of `package:ffigen` to generate the bindings.
