[InputEvent] Support |sequence<Range> getRanges()| in 'beforeinput'

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 651ee134743c67f4237bee6418d15bc2fca8da9f..b16f476de889a3b9c5e99100004ff2ea44978437 100644
--- a/third_party/WebKit/Source/core/events/InputEvent.h
+++ b/third_party/WebKit/Source/core/events/InputEvent.h
@@ -10,6 +10,8 @@
 
 namespace blink {
 
+class Range;
+
 class InputEvent final : public UIEvent {
     DEFINE_WRAPPERTYPEINFO();
 
@@ -47,23 +49,43 @@ public:
         IsComposing = true,
     };
 
-    static InputEvent* createBeforeInput(InputType, const String& data, EventCancelable, EventIsComposing);
+    static InputEvent* createBeforeInput(InputType, const String& data, EventCancelable, EventIsComposing, const RangeVector*);
 
     String inputType() const;
     const String& data() const { return m_data; }
     bool isComposing() const { return m_isComposing; }
+    // Returns a copy of target ranges during event dispatch, and returns an empty
+    // vector after dispatch.
+    // TODO(chongz): Return Vector<StaticRange>.
+    HeapVector<Member<Range>> getRanges() const { return m_ranges; };
 
     bool isInputEvent() const override;
 
+    EventDispatchMediator* createMediator() override;
+
     DECLARE_VIRTUAL_TRACE();
 
 private:
+    friend class InputEventDispatchMediator;
     InputEvent();
     InputEvent(const AtomicString&, const InputEventInit&);
 
     InputType m_inputType;
     String m_data;
     bool m_isComposing;
+    // We have to stored |Range| internally and only expose |StaticRange|, please
+    // see comments in |InputEventDispatchMediator::dispatchEvent()|.
+    RangeVector m_ranges;
+};
+
+class InputEventDispatchMediator final : public EventDispatchMediator {
+public:
+    static InputEventDispatchMediator* create(InputEvent*);
+
+private:
+    explicit InputEventDispatchMediator(InputEvent*);
+    InputEvent& event() const;
+    DispatchEventResult dispatchEvent(EventDispatcher&) const override;
 };
 
 DEFINE_EVENT_TYPE_CASTS(InputEvent);