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

third_party/WebKit/Source/core/inspector/InspectorInputAgent.h

Index: third_party/WebKit/Source/core/inspector/InspectorInputAgent.h
diff --git a/third_party/WebKit/Source/core/inspector/InspectorInputAgent.h b/third_party/WebKit/Source/core/inspector/InspectorInputAgent.h
index a14c89f57de804d03283864f4bfb46a22487c808..6bc6063e23975c8fbaf95b8296fe40cf11817c1d 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorInputAgent.h
+++ b/third_party/WebKit/Source/core/inspector/InspectorInputAgent.h
@@ -38,9 +38,12 @@
 #include "wtf/text/WTFString.h"
 
 namespace blink {
+class ExecutionContext;
+class Event;
 class InspectedFrames;
 class PlatformKeyboardEvent;
 class PlatformMouseEvent;
+class RegisteredEventListener;
 
 class CORE_EXPORT InspectorInputAgent final : public InspectorBaseAgent<InspectorInputAgent, protocol::Frontend::Input>, public protocol::Backend::Input {
     WTF_MAKE_NONCOPYABLE(InspectorInputAgent);
@@ -53,15 +56,29 @@ public:
     ~InspectorInputAgent() override;
     DECLARE_VIRTUAL_TRACE();
 
-    // Methods called from the frontend for simulating input.
+    // InspectorBaseAgent overrides
+    void restore() override;
+    void disable(ErrorString*) override;
+
+    // Protocol implementation.
     void dispatchTouchEvent(ErrorString*, const String& type, PassOwnPtr<protocol::Array<protocol::Input::TouchPoint>> touchPoints, const Maybe<int>& modifiers, const Maybe<double>& timestamp) override;
+    void setBlockedEventsWarningThreshold(ErrorString*, double threshold) override;
+
+    // InspectorInstrumentation method(s).
+    void reportBlockedEvent(ExecutionContext*, const Event*, RegisteredEventListener*, double delayedSeconds);
+
+    // InpsectorOverrides method(s).
+    bool shouldReportBlockedEvent(const Event*);
+
 private:
     explicit InspectorInputAgent(InspectedFrames*);
 
+    void setEnabled(bool);
+
     Member<InspectedFrames> m_inspectedFrames;
+    double m_blockedEventsWarningThreshold;
 };
 
-
 } // namespace blink
 
 #endif // !defined(InspectorInputAgent_h)