Early Initialization Experiment for Extension APIs
Extension API Startup takes 100-200 ms in the 75th percentile case on PreMainMessageLoop during extension initialization.
This experiment early initializes this data on another thread to see if that would speed up the overall time.
If this experiment goes well, we'll open an investigation to do a proper async framework for initialization.
BUG=470743
Review URL: https://codereview.chromium.org/
1060513003
Cr-Commit-Position: refs/heads/master@{#325874}