20954 renaming e2e tests to integration (cla: yes)

20957 Clear GL context before Gr context (cla: yes)

20960 Started printing out error messages when the observatory won’t be reachable because of permissions problems. (cla: yes, platform-ios)

20965 Only clear GL context after changing the thread configuration (cla: yes, waiting for tree to go green)

20967 Manual roll of Dart b29f228f62…016e8880f0 (cla: yes)

20974 [fuchsia] Send trace events to system tracing on all configurations (cla: yes)

20976 Always set the callback during Rasterizer setup (cla: yes, waiting for tree to go green)