Change app icon, primary color, FAB color and snackbar action color(1/2)

1) New round launcher with dark blue color for all devices
2) set primary color to #2a56c6 (including action bar, list headers,
all buttons)
3) set status bar color to #2a56c6
4) set fab color to #f50057
5) set snackbar action text color to #ffffff

Bug: 32243198

Test: Manual test on nexus 5x,  nexus 7 and pixel

Change-Id: Iab8b224ee416729c17ba32d2cb5f3250c8298fcb