Vectorize omnibox dropdown icons

components/omnibox/browser/autocomplete_match.h

Index: components/omnibox/browser/autocomplete_match.h
diff --git a/components/omnibox/browser/autocomplete_match.h b/components/omnibox/browser/autocomplete_match.h
index bcc9d9ab5e05cb773b7cbd38942bd031030cb9ea..270a2e25f38a67ba32c09316224453e3a2e0e231 100644
--- a/components/omnibox/browser/autocomplete_match.h
+++ b/components/omnibox/browser/autocomplete_match.h
@@ -25,6 +25,10 @@ namespace base {
 class Time;
 }  // namespace base
 
+namespace gfx {
+enum class VectorIconId;
+}  // namespace gfx
+
 const char kACMatchPropertyInputText[] = "input text";
 const char kACMatchPropertyContentsPrefix[] = "match contents prefix";
 const char kACMatchPropertyContentsStartIndex[] = "match contents start index";
@@ -102,6 +106,9 @@ struct AutocompleteMatch {
   // type to show in the completion popup.
   static int TypeToIcon(Type type);
 
+  // Gets the vector icon identifier for the icon to be shown for |type|.
+  static gfx::VectorIconId TypeToVectorIcon(Type type);

[Evan Stade, 2015/10/20 00:49:13]

we may want this to return a gfx::Image, but if that becomes clear later it
should be easy to change.

+
   // Comparison function for determining when one match is better than another.
   static bool MoreRelevant(const AutocompleteMatch& elem1,
                            const AutocompleteMatch& elem2);