Add 80% and 250% zoom level to settings.

components/zoom/page_zoom_constants.cc

Index: components/zoom/page_zoom_constants.cc
diff --git a/components/zoom/page_zoom_constants.cc b/components/zoom/page_zoom_constants.cc
index 5c8dacec67d2093b2bdc0967dd11741dc4a03aff..388a337ae116aad6cfb27eb94520e3850eabb38b 100644
--- a/components/zoom/page_zoom_constants.cc
+++ b/components/zoom/page_zoom_constants.cc
@@ -8,8 +8,9 @@
 
 namespace zoom {
 
-// This list is duplicated in chrome/browser/resources/pdf/viewport.js. Please
-// make sure the two match.
+// This list is duplicated in chrome/browser/resources/pdf/viewport.js and in
+// chrome/browser/resources/settings/appearance_page/appearance_page.js. Please
+// make sure the three match.
 const double kPresetZoomFactors[] = {0.25, 1 / 3.0, 0.5, 2 / 3.0, 0.75, 0.8,
                                      0.9, 1.0, 1.1, 1.25, 1.5, 1.75, 2.0, 2.5,
                                      3.0, 4.0, 5.0};