[InputEvent] Fire 'beforeinput' during typing, pressing hot keys and IME composition

third_party/WebKit/Source/core/events/InputEvent.h

Index: third_party/WebKit/Source/core/events/InputEvent.h
diff --git a/third_party/WebKit/Source/core/events/InputEvent.h b/third_party/WebKit/Source/core/events/InputEvent.h
index 8bfb45efe58379f7a6dbe1792045450897b70316..4c14550f401bf7dfdfdceeed9d0c620cd9115c8a 100644
--- a/third_party/WebKit/Source/core/events/InputEvent.h
+++ b/third_party/WebKit/Source/core/events/InputEvent.h
@@ -24,6 +24,29 @@ public:
         return new InputEvent(type, initializer);
     }
 
+    enum class InputType {
+        None,
+        InsertText,
+        ReplaceContent,
+        DeleteContent,
+        DeleteComposedCharacter,
+        Undo,
+        Redo,
+
+        // Add new input types immediately above this line.
+        NumberOfInputTypes,
+    };
+
+    enum EventCancelable : bool {
+        NotCancelable = false,
+        IsCancelable = true,
+    };
+
+    static InputEvent* createBeforeInput(InputType, const String& data, EventCancelable);
+
+    String inputType() const;
+    const String& data() const { return m_data; }
+
     bool isInputEvent() const override;
 
     DECLARE_VIRTUAL_TRACE();
@@ -31,6 +54,9 @@ public:
 private:
     InputEvent();
     InputEvent(const AtomicString&, const InputEventInit&);
+
+    InputType m_inputType;
+    String m_data;
 };
 
 DEFINE_EVENT_TYPE_CASTS(InputEvent);