Update magnification mode naming

Adding the common underscore-separated prefix to the definition of
the magnification mode for fixing the warning when syncing the atom
patch (ag/13321748) to google3 (cl/351493689).

Bug: 154021596
Test: build pass
Merged-In: I7686a2ac0c317a76cf2dfdd092e40f12cd546cce
Change-Id: I7686a2ac0c317a76cf2dfdd092e40f12cd546cce
(cherry picked from commit 9f1747eb5179011108206c8c3493c649583658de)
1 file changed
tree: cb0166af3313f6edb8f43037b476e4eb819b78bc
  1. stats/