* Clean up some flutter_tools tests

* Remove arbitrary retry that happens even for fundamental errors, and generally clean up _DevFSHttpWriter.

* Update dependencies (requires fixes; see next commit)

* Fixes for new dependencies.

* Update packages
* Capture JSON RPC errors that presently get swallowed

* Wrap test.main with a custom processor
* Report test results to bigquery table

* [Gallery] Fortnightly demo moved from flutter/samples.

* [Gallery] Fortnightly analysis corrections.

* [Gallery] Minor rename.

* [Gallery] Making floats ints.

* [Gallery] Fortnightly minor visual polish.

* [Gallery] Formatting.

* [Gallery] Upping package version for gallery to support fortnightly demo.

* [Gallery] Fortnightly copy correction.

* [Gallery] Fortnightly study polish.

* [Gallery] Fortnightly polish.

* [Gallery] Fortnightly copy correction.

* [Gallery] Fortnightly copy now held in '''.

* [Gallery] Fortnightly comment.

* [Gallery] Updates necessary when flutter_gallery_assets updates.

* [Gallery] Updating macrobenchmarks because we updated flutter_gallery_assets.

* [Gallery] Moving spaces to beginning of copy lines.

* [Gallery] Copy correction.

* [Gallery] Adding tooltip to satisfy smoke test.

* [Gallery] Minor pr feedback.

* [Gallery] Forced upgrade.

* Update packages

* Change test for isFile

This reverts commit 4ec8883b.

* Revert "Add dashing config file for generating docset from flutter docs (#24374)"

This reverts commit ec8ca860.

* Revert "Update driver script to execute test through test_core (#24168)"

This reverts commit 6c62cf33.

This reverts commit 71e9bd6f.

This reverts commit 76a1abd4.

This reverts commit 949cfcf1.

Adds a Fuchsia compatibility function that allows for connecting to a
specific Isolate by name when running Flutter Driver on a Fuchsia
device.  This will check over multiple Dart VM's in an attempt to find
an Isolate by its name.

This reverts commit 3c56e6c7.

It breaks the AOT build.

* first pass

* revert WidgetsBindingObserver

* disable prefer_mixin

* docs and more mixins

* newer engine; binding fixes

* upgrade dependencies

* fix test binding

* remove whitespace

* remove the obsolete `enableSuperMixins: true`

* upgrade dartdoc to 0.22.0

* temporarily use git version of dartdoc

* fix pub global activate syntax

* use dartdoc 0.23.0

https://github.com/flutter/flutter/issues/19578

<img width="273" alt="pesto_before" src="https://user-images.githubusercontent.com/13839358/43009716-64b6d726-8c0c-11e8-989a-13eaff72ccee.png">
<img width="273" alt="pesto_after" src="https://user-images.githubusercontent.com/13839358/43009717-66074a34-8c0c-11e8-92ae-f5fb4074f43a.png">