TBR: @goderbauer

This reverts commit baea9bf7.

Additionally,   we let the test run on mac8 with iphonexs because the test won't run on Xcode 10.1 (mac3-7). Hence we force it to run on mac8 which currently has Xcode 10.2.

This reverts commit 67b5bdf9.

Reason: it broke device lab.

TBR: @goderbauer 

This reverts commit f1e7fe81.

This fix is in https://github.com/flutter/packages/pull/39

This reverts commit 652be88e.

This fix is in https://github.com/flutter/packages/pull/37

This reverts commit af9f424d.

Reverts flutter/flutter#39439

Reason: this passed the local device lab test on my Macbook but it failed in the actual device lab. Will investigate, fix, and reland.

TBR: @dnfield @goderbauer @tvolkert @Hixie 

For https://github.com/flutter/flutter/issues/33899

Test added:
- simple_animation_perf_ios

Test modified:
- backdrop_filter_perf_ios__timeline_summary

We'll add the CPU/GPU measurement to more iOS tests
once it's proven to be non-flaky.

For https://github.com/flutter/flutter/issues/36064

That performance regression is iOS-only so we'd better get the
benchmarks running on iOS.

* Add test case for Flutter Issue #27677 as a benchmark.

See https://github.com/flutter/flutter/issues/27677

I got the following results running the test on a Moto E2 which
will help us determine how much we can gain by analyzing the
operations and eliminating unnecessary repaints based on
dirty rectangles/regions.

no blurs       - avg 216.0 fps over 3 samples
blur the group - avg  22.9 fps over 3 samples
blur each txt  - avg   3.4 fps over 3 samples

* Added the new benchmark to be tracked on the dashboard.

This reverts commit adc8e159.

This should be safe to land once https://github.com/flutter/flutter/pull/28530 gets merged

Merge on yellow doc test because the doc test is actually green.

For https://github.com/flutter/flutter/issues/24712

This test verifies that https://github.com/flutter/engine/pull/6923 will speedup the average rasterize time of this test from ~150ms to ~10ms

Please see non-auto-generated files in https://github.com/flutter/flutter/pull/25381/commits/37b21d9fb4756a8d8d12ae0def1d0640740c8818

* Add start-up test for flutter_view sample

* add reportMetrics flag to startup test

* rewording in manifest.yaml

* fix flutter watch benchmark

Syncs https://github.com/flutter/cocoon/commit/d2d7950ecd2c72421d75d9b5d54805cc554e92a8

* Split Android/iOS impl behind a unified interface

Syncs https://github.com/flutter/cocoon/commit/db87e10fa54317115479d0b85280c7e5eed08ff7

* Switch from pub get to flutter packages get

Syncs https://github.com/flutter/cocoon/commit/b378005cbbc5330058d5240a2970ca477c2c9722

* "silent" option in test runner; fix analysis errors;