Change log for Flutter 1.9.1

Tools

SDK

Release notes

1.9.1 change log

PRs closed in this release of flutter/flutter

PRs closed in this release of flutter/engine

PRs closed in this release of flutter/flutter

From Fri Jun 21 22:31:55 2019 -0400 to Sun Aug 18 12:22:00 2019 -0700

28090 Ensure that cache dirs and files have appropriate permissions (cla: yes, tool)

29489 Made a few grammatical changes (cla: yes, team)

32511 Rendering errors with root causes in the widget layer should have a reference to the widget (cla: yes, customer: countless, customer: headline, framework)