Implement backspace support.

Pressing backspace pops the user up a directory level if they aren't at
the root directory of the current root.

BUG=27123794

Change-Id: I8f0a88a1194bf8f082d0b057a288a0c3da3068f6
1 file changed
tree: e10c79e7ddb77479177c35c071506735dc856e71
  1. res/
  2. src/
  3. tests/
  4. Android.mk
  5. AndroidManifest.xml
  6. lint.xml
  7. wrap_alpha.py