7832 Shut down and restart the Dart VM as needed. (cla: yes)

7834 [fuchsia][SCN-1054] Map elevation onto -Z in Scenic (cla: yes)

7836 Delete GL textures when they are released from the texture registry. (cla: yes)

7837 Fix NullPointerException in SurfaceTextureRegistryEntry (cla: yes)

7838 Fix NullPointerException in ResourceCleaner (cla: yes)

7839 Ensure to pass dill file after VM options for gen_snapshot (cla: yes)

7841 Don’t call static method from instance variable (cla: yes)

7843 Add support for calling into other plugins from a background context on iOS (cla: yes)

7845 Add fml::FileExists implementation for Windows (cla: yes)