Add flag to force touch events to be passive during fling as a runtime feature

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 517261bee52d62b16aeb6229c87a977c8909510a..ca56a507e43d90483b4a53c257ca78fa2e871475 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5687,10 +5687,16 @@ Keep your key file in a safe place. You will need it to create new versions of y
       </message>
       <message name="IDS_FLAGS_PASSIVE_DOCUMENT_EVENT_LISTENERS_DESCRIPTION" desc="Description for the flag to adjust the default behaviour for document level passive touch listeners.">
         Forces touchstart, and touchmove event listeners on document level targets (which haven't requested otherwise) to be treated as passive.
-      </message>
+      </message>      
       <message name="IDS_FLAGS_PASSIVE_DOCUMENT_EVENT_LISTENERS_NAME" desc="Name for the flag to adjust the default behaviour for document level passive listeners.">
         Document Level Event Listeners Passive Default
       </message>
+      <message name="IDS_FLAGS_PASSIVE_EVENT_LISTENERS_DUE_TO_FLING_DESCRIPTION" desc="Description for the flag to adjust the default behaviour for passive touch listeners during fling.">
+        Forces touchstart, and first touchmove per scroll event listeners during fling to be treated as passive.
+      </message>
+      <message name="IDS_FLAGS_PASSIVE_EVENT_LISTENERS_DUE_TO_FLING_NAME" desc="Name for the flag to adjust the default behaviour for passive touch listeners during fling.">
+        Touch Event Listeners Passive Default During Fling
+      </message>
       <message name="IDS_FLAGS_PASSIVE_EVENT_LISTENER_TRUE" desc="Choice for passive listeners to default to true on all nodes not explicitly set.">
         True (when unspecified)
       </message>