Sample driver test working on Fuchsia

[iskakaushik]

No description provided.

[iskakaushik]

The scroll_perf_test doesn't yet work on Fuchsia due to the differences in tracing mechanism. So I added another sample test to serve as an example for the devicelab work to enable running Fuchsia tests.

Instructions to run this test

Prerequisites

1. Have a functional flutter/flutter repo. You should be able to run driver tests on say an Android device.

Steps

1. Cache the Fuchsia artifacts needed by the Flutter tool

   1. flutter precache --fuchsia
   2. flutter precache --flutter_runner

2. Setup your Fuchsia tree to serve tiles and have the ssh keys ready

   1. You probably don’t need all of these options in fx-set but this is what I had: fx set workstation.chromebook-x64 --with-base //garnet/packages:default --with-base //bundles:tools
   2. fx clean-build
   3. fx serve (This should give you the device name, save it to FUCHSIA_DEVICE_NAME)
   4. export FUCHSIA_BUILD_DIR=$FUCHSIA_DIR/out/default

3. Go to the folder of an existing driver test: $FLUTTER_FRAMEWORK_DIR/examples/stocks

4. Apply the patch at Sample driver test working on Fuchsia #45652 (I will try to get it landed soon)

5. Run flutter drive -d $FUCHSIA_DEVICE_NAME --target=test_driver/stock_view.dart

[dnfield]

It's not clear to me why flutter-build was green for this... /cc @digiter @keyonghan @godofredoc