[DevTools] Add interstitial events to Inspector domain.

Source/devtools/front_end/main/Main.js

Index: Source/devtools/front_end/main/Main.js
diff --git a/Source/devtools/front_end/main/Main.js b/Source/devtools/front_end/main/Main.js
index 888c0f4d9dab21a429cd2bb756ce21004ddbdce1..05ec9930dcc27846239e6ad68d7279ad4b8432ef 100644
--- a/Source/devtools/front_end/main/Main.js
+++ b/Source/devtools/front_end/main/Main.js
@@ -632,6 +632,22 @@ WebInspector.Main.prototype = {
     evaluateForTestInFrontend: function(callId, script)
     {
         WebInspector.evaluateForTestInFrontend(callId, script);
+    },
+
+    /**
+     * @override
+     */
+    interstitialShown: function()
+    {
+        // Frontend is not interested in interstitials.
+    },
+
+    /**
+     * @override
+     */
+    interstitialHidden: function()
+    {
+        // Frontend is not interested in interstitials.
     }
 }