Somewhere between flutter/engine@ab09530 and flutter/engine@e5442c9 we regressed the flutter_gallery__back_button_memory diff_total_kb benchmark by 40x, the end_total_kb benchmark by about 1.3x, and some of the other memory benchmarks by smaller amounts.

The candidate checkins are:

• @jason-simmons Return an error to Dart when spawning an isolate with an unsupported URI (Return an error to Dart when spawning an isolate with an unsupported URI engine#3443)
• @chinmaygarde Remove .pyc files from licenses.golden. (Remove .pyc files from licenses.golden. engine#3445)
• @chinmaygarde Roll Skia revision to 3f81f3703a68755c88f5cc4a87728b98f34c4cd4 (Roll Skia revision to 3f81f3703a68755c88f5cc4a87728b98f34c4cd4 engine#3438)
• @jason-simmons Adapt the physical model layer for Fuchsia (Adapt the physical model layer for Fuchsia engine#3441)
• @chinmaygarde Remove rarely used GLConnection stuff in flow. (Remove rarely used GLConnection stuff in flow. engine#3440)
• @poitch New mozart input events. (New mozart input events. engine#3439)
• @chinmaygarde Allow plugging in a software backend for rendering in the shell. (Allow plugging in a software backend for rendering in the shell. engine#3404)
• @vardhan-cr @chinmaygarde Remove callback from ApplicationController. Kill fidl interface. (Remove callback from ApplicationController.Kill fidl interface. engine#3435)
• @danrubel modify RunFrom methods to return error code rather than call exit (modify RunFrom<X> methods to return error code rather than call exit engine#3428)
• @jason-simmons Physical model layer that can draw shadows for a Material widget (Physical model layer that can draw shadows for a Material widget engine#3424)
• @chinmaygarde Remove texture image. (Remove texture image. engine#3434)
• @chinmaygarde Update skia to 1c8e82b72bfeb1a02297688cf082c365b62705f7 (Update skia to 1c8e82b72bfeb1a02297688cf082c365b62705f7 engine#3433)