Address API review from the council

Here are the list this CL includes:
- Adding missing @NonNull, @Nullable, @IntRange annotations
- Added @Px annotation to Paint.set/getWordSpacing
- Change Builder classes to final.
- Change FileDescriptor to ParcelFileDescriptor as described in guideline.
- With this change, additional error handling is required in old
  Typeface.Builder but we can keep the same behavior (silently fallback to
  system fallback in error case).
- Fix comment in getLineHyphenEdit in LineBreaker.Result
- Rename setJustified to setJustificationMode in LineBreaker.Builder

Fix: 126702154
Fix: 126701272
Fix: 126701569
Fix: 126701953
Fix: 126701507
Fix: 126701667
Fix: 126700866
Fix: 126701009
Fix: 126700795
Fix: 126700292
Fix: 126699209
Fix: 124795407
Fix: 124795470
Bug: 124794844
Bug: 124794899

Test: m update-api
Test: TreeHugger

Change-Id: If6e8566b0eef9151d35d75b7f258128d7d3df358