Define type casts for some ScrollableArea subclasses.

Review URL: https://codereview.chromium.org/1645813002

Cr-Commit-Position: refs/heads/master@{#372510}

3 files changed, 9 insertions, 0 deletions

diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index cec3011..6521e00 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -922,6 +922,7 @@ inline void FrameView::incrementVisuallyNonEmptyPixelCount(const IntSize& size)
 }
 
 DEFINE_TYPE_CASTS(FrameView, Widget, widget, widget->isFrameView(), widget.isFrameView());
+DEFINE_TYPE_CASTS(FrameView, ScrollableArea, scrollableArea, scrollableArea->isFrameView(), scrollableArea.isFrameView());
 
 } // namespace blink
 
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
index 055db43..d7e88f6 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
@@ -332,6 +332,7 @@ public:
     IntRect rectForVerticalScrollbar(const IntRect& borderBoxRect) const;
 
     Widget* widget() override;
+    bool isPaintLayerScrollableArea() const override { return true; }
 
     DECLARE_VIRTUAL_TRACE();
 
@@ -412,6 +413,10 @@ private:
 #endif
 };
 
+DEFINE_TYPE_CASTS(PaintLayerScrollableArea, ScrollableArea, scrollableArea,
+    scrollableArea->isPaintLayerScrollableArea(),
+    scrollableArea.isPaintLayerScrollableArea());
+
 } // namespace blink
 
 #endif // LayerScrollableArea_h
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollableArea.h b/third_party/WebKit/Source/platform/scroll/ScrollableArea.h
index 49b5b39..a6904b6 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollableArea.h
+++ b/third_party/WebKit/Source/platform/scroll/ScrollableArea.h
@@ -280,6 +280,9 @@ public:
     // Returns the widget associated with this ScrollableArea.
     virtual Widget* widget() { return nullptr; }
 
+    virtual bool isFrameView() const { return false; }
+    virtual bool isPaintLayerScrollableArea() const { return false; }
+
     // Need to promptly let go of owned animator objects.
     EAGERLY_FINALIZE();
     DECLARE_VIRTUAL_TRACE();