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

components/omnibox/browser/omnibox_field_trial.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/omnibox/browser/omnibox_field_trial.h"
 
 #include <cmath>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 73 matching lines @@
 
 // Feature used to display the title of the current URL match.
 const base::Feature kDisplayTitleForCurrentUrl{
     "OmniboxDisplayTitleForCurrentUrl", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Feature used for the max autocomplete matches UI experiment.
 const base::Feature kUIExperimentMaxAutocompleteMatches{
     "OmniboxUIExperimentMaxAutocompleteMatches",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Feature used for hiding the suggestion URL path as a UI experiment.
+const base::Feature kUIExperimentHideSuggestionUrlPath{
+    "OmniboxUIExperimentHideSuggestionUrlPath",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
+// Feature used for hiding the suggestion URL protocol as a UI experiment.
+const base::Feature kUIExperimentHideSuggestionUrlProtocol{
+    "OmniboxUIExperimentHideSuggestionUrlProtocol",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
+// Feature used for hiding the suggestion URL subdomain as a UI experiment.
+// This only hides some special non-informative subdomains such as "www" or "m".

[Justin Donnelly, 2017/06/13 20:58:12]

And then s/non-/trivially/ here.

[tommycli, 2017/06/13 21:47:09]

Done.

+const base::Feature kUIExperimentHideSuggestionUrlSubdomain{
+    "OmniboxUIExperimentHideSuggestionUrlSubdomain",
+    base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Feature used for the omnibox narrow suggestions dropdown UI experiment.
 const base::Feature kUIExperimentNarrowDropdown{
     "OmniboxUIExperimentNarrowDropdown", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Feature used for the vertical margin UI experiment.
 const base::Feature kUIExperimentVerticalLayout{
     "OmniboxUIExperimentVerticalLayout", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Feature used for the vertical margin UI experiment.
 const base::Feature kUIExperimentVerticalMargin{
@@ skipping 737 matching lines @@
   if (it != params.end())
     return it->second;
   // Fall back to the global instant extended context.
   it = params.find(rule + ":" + page_classification_str + ":*");
   if (it != params.end())
     return it->second;
   // Look up rule in the global context.
   it = params.find(rule + ":*:*");
   return (it != params.end()) ? it->second : std::string();
 }