Mac Video Capture: expose --enable-avfoundation as tristate in chrome://flags

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 6f2a3f18279c67608852de17cd6032dfd2ad8509..5b96d2d3729073745facb01b0b85b4d865235e8b 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -489,6 +489,14 @@ const Experiment::Choice kEnableDropSyncCredentialChoices[] = {
     password_manager::switches::kDisableDropSyncCredential, "" },
 };
 
+#if defined(OS_MACOSX)
+const Experiment::Choice kEnableAVFoundationChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED, switches::kEnableAVFoundation, ""},
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kForceQTKit, ""}
+};
+#endif
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the experiment is the internal name. If you'd like to
@@ -1214,7 +1222,7 @@ const Experiment kExperiments[] = {
     IDS_FLAGS_ENABLE_AVFOUNDATION_NAME,
     IDS_FLAGS_ENABLE_AVFOUNDATION_DESCRIPTION,
     kOsMac,
-    SINGLE_VALUE_TYPE(switches::kEnableAVFoundation)
+    MULTI_VALUE_TYPE(kEnableAVFoundationChoices)
   },
 #endif
   {