am 099403d: AI 147796: Add widget design guidelines to new UI Guidelines

Merge commit '099403d15d1f87e7a17f8e2aa3d9a8bc4afa4500' into donut

* commit '099403d15d1f87e7a17f8e2aa3d9a8bc4afa4500':
  AI 147796: Add widget design guidelines to new UI Guidelines area in dev guide.
tree: 40dabe7b82ce485e4d3cee4fce9d2e3aea0a880a
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh