Force events to be non blocking if main thread is unresponsive.

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index 5e28c3f52aca23b5c2eaf86e58803b7302c1285f..59e4f826761f4e01ef678e2b73f03376d196fc35 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -67,6 +67,12 @@ const base::Feature kMediaDocumentDownloadButton{
 const base::Feature kNewMediaPlaybackUi{"NewMediaPlaybackUi",
                                         base::FEATURE_ENABLED_BY_DEFAULT};
 
+// An experiment forcing events to be treated as though their listeners are
+// passive when the main thread is deemed unresponsive.

[dtapuska, 2016/08/23 16:18:29]

s/passive/non-blocking ?

[tdresser, 2016/08/23 17:25:32]

Done.

+// See crbug.com/599609.
+const base::Feature kMainThreadBusyScrollIntervention{
+    "MainThreadBusyScrollIntervention", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Non-validating reload for desktop.
 // See https://crbug.com/591245
 const base::Feature kNonValidatingReloadOnNormalReload{