User pods centered with any resolution.

chrome/browser/resources/chromeos/login/user_pod_row.css

Index: chrome/browser/resources/chromeos/login/user_pod_row.css
diff --git a/chrome/browser/resources/chromeos/login/user_pod_row.css b/chrome/browser/resources/chromeos/login/user_pod_row.css
index 44f8a678827f6bd84ae1a858c5cfc6d4f8ceae36..0f8236a73b1a4c17e0b455f2cf22c02adb26ec5b 100644
--- a/chrome/browser/resources/chromeos/login/user_pod_row.css
+++ b/chrome/browser/resources/chromeos/login/user_pod_row.css
@@ -8,17 +8,24 @@
 podrow {
   -webkit-box-align: center;
   -webkit-box-pack: center;
-  -webkit-transition: width 180ms ease;
+  /* Temporarily disabled because animation interferes with updating screen's
+   size. */
+  /* -webkit-transition: width 180ms ease; */
   display: -webkit-box;
   max-height: 650px;
-  overflow: hidden;
-  padding: 23px 15px;
-  position: relative;
-  width: 1152px;
+  overflow: visible;
 }
 
 podrow[ncolumns='4'] {
-  width: 900px;
+  width: 880px;
+}
+
+podrow[ncolumns='5'] {
+  width: 1100px;
+}
+
+podrow[ncolumns='6'] {
+  width: 1152px;
 }
 
 /* Hide the pod row while images are loading. */