views: implement dialog width snapping

chrome/browser/ui/views/harmony/harmony_layout_delegate.cc

Index: chrome/browser/ui/views/harmony/harmony_layout_delegate.cc
diff --git a/chrome/browser/ui/views/harmony/harmony_layout_delegate.cc b/chrome/browser/ui/views/harmony/harmony_layout_delegate.cc
index 8afd20369d3b97654914b2ba6851b72ac51e2eea..fe65ee36b8d1d88e56598e50d482039bb8926cb0 100644
--- a/chrome/browser/ui/views/harmony/harmony_layout_delegate.cc
+++ b/chrome/browser/ui/views/harmony/harmony_layout_delegate.cc
@@ -84,15 +84,11 @@ bool HarmonyLayoutDelegate::IsHarmonyMode() const {
   return true;
 }
 
-int HarmonyLayoutDelegate::GetDialogPreferredWidth(DialogWidth width) const {
-  switch (width) {
-    case DialogWidth::SMALL:
-      return 320;
-    case DialogWidth::MEDIUM:
-      return 448;
-    case DialogWidth::LARGE:
-      return 512;
+int HarmonyLayoutDelegate::GetSnappedDialogWidth(int min_width) const {
+  for (int width : {320, 448, 512}) {
+    if (min_width <= width)
+      return width;
   }
-  NOTREACHED();
-  return 0;
+  return ((min_width + kHarmonyLayoutUnit - 1) / kHarmonyLayoutUnit) *
+         kHarmonyLayoutUnit;
 }