This directly addresses our two top impacting dev issues:
1. Local Development Iteration Speed
2. Code Complexity / Technical Debt

This bug is to track the following:
1. Design doc on proposed components
2. Discussion and revisions on java@chromium.org
3. Implementation

Smaller targets mean that incremental builds will be faster (compiling smaller targets rather than all the code in chrome_java).

Separate components reduces the complexity of chrome_java as well as makes using Android's dynamic bundling easier.