Add PlatformFrameView class.

third_party/WebKit/Source/web/ChromeClientImpl.h

Index: third_party/WebKit/Source/web/ChromeClientImpl.h
diff --git a/third_party/WebKit/Source/web/ChromeClientImpl.h b/third_party/WebKit/Source/web/ChromeClientImpl.h
index cf0cecff7915db2df89b925349bf3c42bd90b1f7..9db76e75405efe27421e7507775cfb8ca7f8ac34 100644
--- a/third_party/WebKit/Source/web/ChromeClientImpl.h
+++ b/third_party/WebKit/Source/web/ChromeClientImpl.h
@@ -110,8 +110,9 @@ class WEB_EXPORT ChromeClientImpl final : public ChromeClient {
   void SetStatusbarText(const String& message) override;
   bool TabsToLinks() override;
   void InvalidateRect(const IntRect&) override;
-  void ScheduleAnimation(LocalFrame*) override;
-  IntRect ViewportToScreen(const IntRect&, const FrameViewBase*) const override;
+  void ScheduleAnimation(const PlatformFrameView*) override;
+  IntRect ViewportToScreen(const IntRect&,
+                           const PlatformFrameView*) const override;
   float WindowToViewportScalar(const float) const override;
   WebScreenInfo GetScreenInfo() const override;
   WTF::Optional<IntRect> VisibleContentRectForPainting() const override;