Emit a console warning when blocking event listener is delayed for too long

third_party/WebKit/Source/core/inspector/InspectorInstrumentation.idl

Index: third_party/WebKit/Source/core/inspector/InspectorInstrumentation.idl
diff --git a/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.idl b/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.idl
index 91feced9e7bbc72d48e23af67303eb424a33d777..bc0a814020c765d97fa54ece108b05286b18ee0f 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.idl
+++ b/third_party/WebKit/Source/core/inspector/InspectorInstrumentation.idl
@@ -63,6 +63,7 @@ interface InspectorInstrumentation {
 #include "core/dom/CharacterData.h"
 #include "core/dom/PseudoElement.h"
 
+class RegisteredEventListener;
 class ThreadableLoaderClient;
 class WebSocketHandshakeRequest;
 class WebSocketHandshakeResponse;
@@ -321,6 +322,9 @@ class XMLHttpRequest;
 
     [Page]
     void windowCreated(LocalFrame* opener, LocalFrame* created);
+
+    [Input]
+    void reportBlockedEvent([Keep] ExecutionContext*, const Event*,  RegisteredEventListener*, double delayedSeconds);
 }
 
 interface InspectorConsoleInstrumentation {
@@ -348,4 +352,7 @@ interface InspectorOverrides {
 
     [Resource]
     bool shouldBlockRequest(LocalFrame*, const ResourceRequest&);
+
+    [Input]
+    bool shouldReportBlockedEvent(ExecutionContext*, const Event*);
 }