am d3301e9f: Add mdpi images for overscroll EdgeGlow.

Merge commit 'd3301e9f6b1e5e3d92e3bfff62e174d8ad27c99c' into gingerbread-plus-aosp

* commit 'd3301e9f6b1e5e3d92e3bfff62e174d8ad27c99c':
  Add mdpi images for overscroll EdgeGlow.