[flutter_tools][web] Add support for web app manifests and arbitrary resource files (from web/) (#48316)

This reverts commit 1613a62e.

Step 1 of 2: Warn about Flutter's FloatingActionButton dependency on ThemeData accent properties (#48435)

This simplifies the diagnostic output for the Shortcuts widget so that if a debugLabel is supplied, then that is printed instead of the full list of shortcut keys in the map. Also, the output of the shortcut map is simplified to have the list of keys presented in more readable text.

* Implement reverseTransitionDuration in TransitionRoute

Document reasoning for why CustomMultiChildLayout size can't depend on children and how to do it (#48451)

This reverts commit 945f206b.
Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>

https://github.com/flutter/engine/compare/f001ea29f1b9...46adf73d5128

git log f001ea29f1b9..46adf73d5128 --first-parent --oneline
2020-01-08 30870216+gaaclarke@users.noreply.github.com Made it so you can specify the old gen heap size. (flutter/engine#15259)
2020-01-08 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from gL-XG... to rTJJV... (flutter/engine#15308)
2020-01-08 xster@google.com Add a deprecation javadoc note to the old FlutterActivity (flutter/engine#15156)
2020-01-08 31859944+LongCatIsLooong@users.noreply.github.com Bump simulator version in IosUnitTests & scenario app in preparation for luci xcode 11 migration (flutter/engine#15154)
2020-01-08 skia-flutter-autoroll@skia.org Roll src/third_party/skia 91e0d7526944..f811fc331a14 (32 commits) (flutter/engine#15306)


If this roll has caused a breakage, revert this CL and stop the roller
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Moves the checks that projects have been configured for desktop to a lower level, where they will cover more codepaths (e.g., 'run'), and improves them to check for native build projects, rather than just directories, to catch cases where the directory exists (e.g., due to accidental creation of generated files).

Also adds links to the error messages pointing to instructions on adding desktop support to a project.

Fixes #47145

[flutter_tool] Refactor Logger and Terminal to (mostly) no longer depend directly on context (#47269)

* Added property for expanded padding of expansion panel for solving #24071

* #24071: Renamed default const name for being more descriptive

* #24071: Improved comment of property expandedPadding

* #24071: Improved test by expanding the expansion panel by header tap + precise assertion

* #24071: Renamed property to be more descriptive

* #24071: Adjusted property comment and added missing trailing commas

* #24071: Improved test by checking real exact header size

* #24071: Added test for default header padding

* #24071: Improved comment of expandedHeaderPadding + code style adjustments

* #24071: Added missing trailing comma

* [fuchsia] Create an entry-point script to run driver tests on Fuchsia

This script currently only paves the device. This will soon run a
driver test on a NUC in LUCI.

* reference the engine script and fix comment

https://github.com/flutter/engine/compare/4e9e69d2b392...f001ea29f1b9

git log 4e9e69d2b392..f001ea29f1b9 --first-parent --oneline
2020-01-08 nurhan@google.com adding windows platform to felt. fixing signal (flutter/engine#15111)


If this roll has caused a breakage, revert this CL and stop the roller
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https://github.com/flutter/engine/compare/a50f1ef56a05...4e9e69d2b392

git log a50f1ef56a05..4e9e69d2b392 --first-parent --oneline
2020-01-08 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/mac-amd64 from nbeLe... to gL-XG... (flutter/engine#15253)
2020-01-08 stuartmorgan@google.com Add plugin_registrar_windows.h to published wrapper (flutter/engine#15265)
2020-01-08 skia-flutter-autoroll@skia.org Roll src/third_party/dart bebc7d3af5bd..c0ca187f2699 (37 commits) (flutter/engine#15252)
2020-01-08 skia-flutter-autoroll@skia.org Roll fuchsia/sdk/core/linux-amd64 from xYmDF... to oNKzr... (flutter/engine#15257)


If this roll has caused a breakage, revert this CL and stop the roller
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This adds CatmullRomCurve animation curve, and a CatmullRomSpline, which is what it uses to do interpolation.

This allows us to create animation curves which can smoothly interpolate the values given to the curve.

Since I've introduced a 2D spline curve, I also created a Curve2D base class for such parametric curves.

https://github.com/flutter/engine/compare/3f52888b3bcf...a50f1ef56a05

git log 3f52888b3bcf..a50f1ef56a05 --first-parent --oneline
2020-01-08 gw280@google.com Migrate flutter_runner from flutter_runner::{Thread,Loop} to fml::{Thread,MessageLoop} (flutter/engine#15118)
2020-01-07 ferhat@gmail.com Refactor BitmapCanvas, lazily allocate canvas, fix image composition bug. (flutter/engine#15153)
2020-01-07 ferhat@gmail.com Recover when browser throws on ImageElement.decode due to too many images (flutter/engine#15160)
2020-01-07 garyq@google.com Fix RectHeightStyle::kMax ascent computation bug (flutter/engine#15106)


If this roll has caused a breakage, revert this CL and stop the roller
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This is follow-up to https://github.com/flutter/flutter/commit/ee7a37f1d3f12ca815d755a557f16765942897a4.