Show media and VTT text tracks in the devtools.

Source/devtools/front_end/NetworkManager.js

Index: Source/devtools/front_end/NetworkManager.js
diff --git a/Source/devtools/front_end/NetworkManager.js b/Source/devtools/front_end/NetworkManager.js
index 90d461fedab91de8ca9e463d2ef0d50ea5153f79..4155f4f1a1a26e03fe1ed1260c4a1c3ef32d0460 100644
--- a/Source/devtools/front_end/NetworkManager.js
+++ b/Source/devtools/front_end/NetworkManager.js
@@ -92,6 +92,7 @@ WebInspector.NetworkManager._MIMETypes = {
     "text/javascript1.3":          {"script": true},
     "text/jscript":                {"script": true},
     "text/livescript":             {"script": true},
+    "text/vtt":                    {"texttrack": true},
 }
 
 WebInspector.NetworkManager.prototype = {
@@ -217,6 +218,7 @@ WebInspector.NetworkDispatcher.prototype = {
 
         if (typeof networkRequest.type === "undefined"
             || networkRequest.type === WebInspector.resourceTypes.Other
+            || networkRequest.type === WebInspector.resourceTypes.Media
             || networkRequest.type === WebInspector.resourceTypes.XHR
             || networkRequest.type === WebInspector.resourceTypes.WebSocket)
             return true;