Add Mojo API for Blink hit testing

third_party/WebKit/Source/core/frame/WebViewFrameWidget.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be found
 // in the LICENSE file.
 
 #ifndef WebViewFrameWidget_h
 #define WebViewFrameWidget_h
 
 #include "core/CoreExport.h"
 #include "core/frame/WebFrameWidgetBase.h"
 #include "core/frame/WebLocalFrameBase.h"
@@ skipping 39 matching lines @@
   void DidEnterFullscreen() override;
   void DidExitFullscreen() override;
   void SetSuppressFrameRequestsWorkaroundFor704763Only(bool) final;
   void BeginFrame(double last_frame_time_monotonic) override;
   void UpdateAllLifecyclePhases() override;
   void Paint(WebCanvas*, const WebRect& view_port) override;
   void LayoutAndPaintAsync(WebLayoutAndPaintAsyncCallback*) override;
   void CompositeAndReadbackAsync(
       WebCompositeAndReadbackAsyncCallback*) override;
   void ThemeChanged() override;
+  //  WebFrame* HitTestFrameAt(const WebFloatPoint&) override;
   WebInputEventResult HandleInputEvent(const WebCoalescedInputEvent&) override;
   void SetCursorVisibilityState(bool is_visible) override;
   bool HasTouchEventHandlersAt(const WebPoint&) override;
   void ApplyViewportDeltas(const WebFloatSize& visual_viewport_delta,
                            const WebFloatSize& layout_viewport_delta,
                            const WebFloatSize& elastic_overscroll_delta,
                            float scale_factor,
                            float browser_controls_shown_ratio_delta) override;
   void RecordWheelAndTouchScrollingCount(bool has_scrolled_by_wheel,
                                          bool has_scrolled_by_touch) override;
@@ skipping 27 matching lines @@
   // WebFrameWidgetBase overrides:
   bool ForSubframe() const override { return false; }
   void ScheduleAnimation() override;
   CompositorMutatorImpl* CompositorMutator() override;
   void SetRootGraphicsLayer(GraphicsLayer*) override;
   GraphicsLayer* RootGraphicsLayer() const override;
   void SetRootLayer(WebLayer*) override;
   WebLayerTreeView* GetLayerTreeView() const override;
   CompositorAnimationHost* AnimationHost() const override;
   WebWidgetClient* Client() const override { return client_; }
+  WebHitTestResult HitTestResultAt(const WebPoint&) override;
   HitTestResult CoreHitTestResultAt(const WebPoint&) override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   WebWidgetClient* client_;
   RefPtr<WebViewBase> web_view_;
   Member<WebLocalFrameBase> main_frame_;
 
   SelfKeepAlive<WebViewFrameWidget> self_keep_alive_;
 };
 
 }  // namespace blink
 
 #endif  // WebViewFrameWidget_h