Improve error handling when loading customizations

Add a loading indicator and an error message if there's
an issue retrieving content for any of the customization
tabs.

Bug: 133326909
Change-Id: I2da6309f5c2b369caffeec4e21c3aa856ddb4e4a
9 files changed
tree: d2a2c39341d9fe5ecf341a11da2ecc69552480df
  1. res/
  2. robolectric_tests/
  3. src/
  4. src_override/
  5. Android.mk
  6. AndroidManifest.xml