Apply icon normalizaiton to placeholder icon generation logic

Bug: 188113211
Test: manual

TL;DR;; also matched placeholder background color to shortcut background
guideline color.

Change-Id: I0df721e40cbb135b99979034ae302dad9f5f5baa
1 file changed
tree: 4b8a4dfbd7b6f89412a8a74ef887c4062dfd2a7e
  1. iconloaderlib/
  2. searchuilib/