38710 PlatformViewLink: Rename CreatePlatformViewController to CreatePlatformViewCallback (a: platform-views, cla: yes, framework)

38719 Fix stages of some iOS devicelab tests (cla: yes, team)

PRs closed in this release of flutter/engine

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

9041 TextStyle.height property as a multiple of font size instead of multiple of ascent+descent+leading. (affects: text input, cla: yes, prod: API break)

9075 IOS Platform view transform/clipping (cla: yes)

9089 Wire up custom event loop interop for the GLFW embedder. (cla: yes)