gen_tasks.go: Assert that all compile tasks are in the JOBS list

Rather than auto-adding the Job, assert that it's listed. This enforces
that the JOBS list is accurate. Add all missing compile Jobs to the list.

BUG=skia:

Change-Id: Ic7a90165ccac36baa52a4674798977021d6812d7
Reviewed-on: https://skia-review.googlesource.com/5848
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Eric Boren <borenet@google.com>
tree: e8604bbe4f17137f2d314043625d90e42c5d7323
  1. recipe_modules/
  2. recipes.py
  3. recipes/