Add field trial and flag to mark HTTP as non-secure.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 7cd9088c635a1dfb9acb32a3d9e702f251b62359..38d22decc15838961c4b8b93cec03d217da30aab 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -780,6 +780,12 @@ const char kManualEnhancedBookmarks[] = "manual-enhanced-bookmarks";
 const char kManualEnhancedBookmarksOptout[] =
     "manual-enhanced-bookmarks-optout";
 
+// Use to opt-in to marking HTTP as non-secure.
+const char kMarkNonSecureAs[]               = "mark-non-secure-as";
+const char kMarkNonSecureAsNeutral[]        = "neutral";
+const char kMarkNonSecureAsDubious[]        = "dubious";
+const char kMarkNonSecureAsNonSecure[]      = "non-secure";
+
 // Forces the maximum disk space to be used by the media cache, in bytes.
 const char kMediaCacheSize[]                = "media-cache-size";