Initialize Package earlier to evaluate commandline args earlier (fixes #1743).
On package initialization, flags from "chromium-args" are added to the Chromium commandline.
Previously, the Package object was initialized in the "PreMainMessageLoopRun" step.
As the GPU flags are already evaluated in the "BrowserThreadsStarted" step (which is before that), this was too late for flags like "--ignore-gpu-blacklist".
Merge pull request #2311 from fancycode/initialize_package_earlier

Initialize Package earlier to evaluate commandline args earlier (fixes #1743)