Move Flutter Gallery to dev/integration_tests/ as it is an older copy used only for testing. The current version of the Flutter Gallery now lives in https://github.com/flutter/gallery.

* Update project.pbxproj files to say Flutter rather than Chromium

Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright.

* Update the copyright notice checker to require a standard notice on all files

* Update copyrights on Dart files. (This was a mechanical commit.)

* Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine.

Some were already marked "The Flutter Authors", not clear why. Their
dates have been normalized. Some were missing the blank line after the
license. Some were randomly different in trivial ways for no apparent
reason (e.g. missing the trailing period).

* Clean up the copyrights in non-Dart files. (Manual edits.)

Also, make sure templates don't have copyrights.

* Fix some more ORGANIZATIONNAMEs

This reverts commit 399aebc4.

It contained Apache 2.0 licensed files, which aren't allowed in flutter/flutter

Add Material Study app Rally as an example app

See https://github.com/flutter/flutter/issues/9257#issuecomment-550503833

This reverts commit a214b462.

* Add Material Study app Rally to examples

Adds the "2D Transformations" demo to the gallery, which shows how to do things such as navigate around a map a la Google Maps, or show a full screen zoomable photo.  The idea is to abstract this code into a first class widget soon.

* fix some formatting issues

* address review comments

* fix indent

* [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.

This reverts commit 4ec8883b.

This reverts commit 76a1abd4.

This reverts commit 949cfcf1.

* enable lint unnecessary_new

* fix tests

* fix tests

* fix tests

* [Gallery] Elevations demo. TODO: Correct icon.

* [Gallery] More elevations for the elevation demo.

* [Gallery] Elevation toggle for elevation demo.

* [Demos] Update temp icon on elevations demo.

* [Demos] Changing action icon.

* [Demos] Same.

* [Demos] Adding new and const.

* [Demos] Reverting formatting.

* [Gallery] PR Feedback.

It was causing problems rolling Flutter into Fuchsia

* re-enable lint unnecessary_const

* remove trailling whitespaces

* remove unnecessary const (after merge)

This reverts commit cc1cf13e.

This appears to trigger an error during AOT snapshot of the gallery as
follows:

```
stdout: [   +6 ms] Building AOT snapshot in release mode (ios-release)...
stdout: [  +15 ms] Extra gen_snapshot options: [--print_snapshot_sizes]
stdout: [   +7 ms] /usr/bin/arch -x86_64 /Users/flutter/.cocoon/flutter/bin/cache/artifacts/engine/ios-release/gen_snapshot --await_is_keyword --causal_async_stacks --packages=.packages --url_mapping=dart:ui,/Users/flutter/.cocoon/flutter/bin/cache/pkg/sky_engine/lib/ui/ui.dart --url_mapping=dart:vmservice_io,/Users/flutter/.cocoon/flutter/bin/cache/pkg/sky_engine/sdk_ext/vmservice_io.dart --embedder_entry_points_manifest=/Users/flutter/.cocoon/flutter/bin/cache/artifacts/engine/ios-release/dart_vm_entry_points.txt --embedder_entry_points_manifest=/Users/flutter/.cocoon/flutter/bin/cache/artifacts/engine/ios-release/dart_io_entries.txt --print_snapshot_sizes --snapshot_kind=app-aot-assembly --assembly=build/aot/arm64/snapshot_assembly.S /Users/flutter/.cocoon/flutter/examples/flutter_gallery/lib/main.dart
stderr: [+9324 ms] Error: 'file:///Users/flutter/.cocoon/flutter/examples/flutter_gallery/lib/demo/cupertino/cupertino_segmented_control_demo.dart': error: line 19 pos 1: circular dependency for function _CupertinoSegmentedControlDemoState
stderr: [        ] class _CupertinoSegmentedControlDemoState extends State {
stderr: [        ] ^
stderr: [  +33 ms] Dart snapshot generator failed with exit code 254
stderr: [        ] Snapshotting (IOSArch.arm64) exited with non-zero exit code: 254
stdout: [        ] Built to build/aot/.
stdout: [  +10 ms] "flutter aot" took 9,485ms.
```

This reverts commit 9d49ee3b.

* Adding segmented control to gallery