Omnibox UI Experiments: Add feature flags for 3 URL elision experiments.

This CL contains just the feature flags. Implementation to follow
shortly.

BUG=732582

Review-Url: https://codereview.chromium.org/2939563002
Cr-Commit-Position: refs/heads/master@{#479215}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 6d0fb260..a7c596d 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2992,6 +2992,24 @@
      SINGLE_VALUE_TYPE(switches::kShowCertLink)},
 #endif
 
+    {"omnibox-ui-hide-suggestion-url-path",
+     flag_descriptions::kOmniboxUIHideSuggestionUrlPathName,
+     flag_descriptions::kOmniboxUIHideSuggestionUrlPathDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(omnibox::kUIExperimentHideSuggestionUrlPath)},
+
+    {"omnibox-ui-hide-suggestion-url-scheme",
+     flag_descriptions::kOmniboxUIHideSuggestionUrlSchemeName,
+     flag_descriptions::kOmniboxUIHideSuggestionUrlSchemeDescription,
+     kOsDesktop,
+     FEATURE_VALUE_TYPE(omnibox::kUIExperimentHideSuggestionUrlScheme)},
+
+    {"omnibox-ui-hide-suggestion-url-trivial-subdomains",
+     flag_descriptions::kOmniboxUIHideSuggestionUrlTrivialSubdomainsName,
+     flag_descriptions::kOmniboxUIHideSuggestionUrlTrivialSubdomainsDescription,
+     kOsDesktop,
+     FEATURE_VALUE_TYPE(
+         omnibox::kUIExperimentHideSuggestionUrlTrivialSubdomains)},
+
     {"omnibox-ui-max-autocomplete-matches",
      flag_descriptions::kOmniboxUIMaxAutocompleteMatchesName,
      flag_descriptions::kOmniboxUIMaxAutocompleteMatchesDescription, kOsDesktop,