[DevTools] Pause input events in WebFrameWidgetImpl while debugging.

Source/web/WebFrameWidgetImpl.h

Index: Source/web/WebFrameWidgetImpl.h
diff --git a/Source/web/WebFrameWidgetImpl.h b/Source/web/WebFrameWidgetImpl.h
index 4c754f50127545169e2273608887111677e86048..64383191f735571a3b56a28e1c877ef5218f0675 100644
--- a/Source/web/WebFrameWidgetImpl.h
+++ b/Source/web/WebFrameWidgetImpl.h
@@ -38,6 +38,7 @@
 #include "public/web/WebFrameWidget.h"
 #include "public/web/WebInputEvent.h"
 #include "web/PageWidgetDelegate.h"
+#include "wtf/HashSet.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/RefCounted.h"
 
@@ -60,6 +61,7 @@ class WebFrameWidgetImpl final : public WebFrameWidget
     , public RefCounted<WebFrameWidgetImpl> {
 public:
     static WebFrameWidgetImpl* create(WebWidgetClient*, WebLocalFrame*);
+    static HashSet<WebFrameWidgetImpl*>& allInstances();
 
     // WebWidget functions:
     void close() override;
@@ -141,6 +143,8 @@ public:
 
     void updateMainFrameLayoutSize();
 
+    void setIgnoreInputEvents(bool newValue);
+
     // Returns the page object associated with this widget. This may be null when
     // the page is shutting down, but will be valid at all other times.
     Page* page() const { return m_page; }