13085 Print more output when gen_package fails (cla: yes)

13086 Gen package output corrected (cla: yes)

13088 felt: use rest args for specifying test targets (cla: yes)

13089 cleanup gen_package.py (cla: yes)

13090 Snapshot the felt tool for faster start-up (cla: yes)

13091 Remove persistent cache unittest timeout (cla: yes)

13093 iOS Platform View: Fixed overrelease of the observer. (cla: yes)

13094 Integrate more SkParagraph builder patches (cla: yes)

13096 [dart_aot_runner] Use the host_toolchain to build kernels (cla: yes)

13097 Update felt README (cla: yes)