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

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 6a15037a89c372c9ca6a80a6712566838d52e670..61b12e8980c0d395d3cb08c7c105baea4dc3deda 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -188,6 +188,15 @@ const Experiment::Choice kNaClDebugMaskChoices[] = {
 };
 #endif
 
+const Experiment::Choice kMarkNonSecureAsChoices[] = {
+    { IDS_MARK_NON_SECURE_AS_NEUTRAL,
+        switches::kMarkNonSecureAs, switches::kMarkNonSecureAsNeutral},
+    { IDS_MARK_NON_SECURE_AS_NON_SECURE,
+        switches::kMarkNonSecureAs, switches::kMarkNonSecureAsNonSecure},
+    { IDS_MARK_NON_SECURE_AS_DUBIOUS,
+        switches::kMarkNonSecureAs, switches::kMarkNonSecureAsDubious}
+};
+
 const Experiment::Choice kMaxTilesForInterestAreaChoices[] = {
   { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
   { IDS_FLAGS_MAX_TILES_FOR_INTEREST_AREA_SHORT,
@@ -2120,6 +2129,14 @@ const Experiment kExperiments[] = {
     SINGLE_VALUE_TYPE(switches::kEnableDelayAgnosticAec)
   },
 
+  {
+    "mark-http-as-non-secure",  // FLAGS:RECORD_UMA
+     IDS_MARK_NON_SECURE_AS_NAME,
+     IDS_MARK_NON_SECURE_AS_DESCRIPTION,
+     kOsAll,
+     MULTI_VALUE_TYPE(kMarkNonSecureAsChoices)
+  },
+
   // NOTE: Adding new command-line switches requires adding corresponding
   // entries to enum "LoginCustomFlags" in histograms.xml. See note in
   // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.