Provide description_class in search provider.

components/omnibox/base_search_provider.cc

Index: components/omnibox/base_search_provider.cc
diff --git a/components/omnibox/base_search_provider.cc b/components/omnibox/base_search_provider.cc
index a18b66c2e26c79041a53e8865af383cdfdb94f4d..7cb5837eae3edb66963d062529355d3c2ad37048 100644
--- a/components/omnibox/base_search_provider.cc
+++ b/components/omnibox/base_search_provider.cc
@@ -222,8 +222,13 @@ AutocompleteMatch BaseSearchProvider::CreateSearchSuggestion(
             suggestion.suggestion().length() - match.contents.length()));
   }
 
-  if (!suggestion.annotation().empty())
+  if (!suggestion.annotation().empty()) {
     match.description = suggestion.annotation();
+    ACMatchClassifications classifications;
+    classifications.push_back(
+        ACMatchClassification(0, ACMatchClassification::DIM));

[Peter Kasting, 2015/02/09 23:46:43]

Why is this DIM instead of NONE like most descriptions?

[Maria, 2015/02/10 01:13:28]

I was under impression that DIM allowed description text to be grey in the UI,
but I tried out NONE and it's still grey, so going with NONE.

[Peter Kasting, 2015/02/10 01:28:51]

Yeah, descriptions are auto-dimmed.  We probably want NONE here so that if in
the future we decide to change how we display descriptions in general, that
change applies to these items as well.

+    match.description_class = classifications;

[Peter Kasting, 2015/02/09 23:46:43]

Nit: Simpler:

  AutocompleteMatch::AddLastClassificationIfNecessary(
      &match.description_class, 0, ACMatchClassification::NONE);

[Maria, 2015/02/10 01:13:28]

Done.

+  }
 
   // suggestion.match_contents() should have already been collapsed.
   match.allowed_to_be_default_match =