Add PlatformFrameView class.

third_party/WebKit/Source/core/page/AutoscrollController.cpp

Index: third_party/WebKit/Source/core/page/AutoscrollController.cpp
diff --git a/third_party/WebKit/Source/core/page/AutoscrollController.cpp b/third_party/WebKit/Source/core/page/AutoscrollController.cpp
index ab94c72c659066921957ed123bd6d1f8589fb5e6..42228126b34354524138d8387478430b98df81af 100644
--- a/third_party/WebKit/Source/core/page/AutoscrollController.cpp
+++ b/third_party/WebKit/Source/core/page/AutoscrollController.cpp
@@ -366,13 +366,13 @@ void AutoscrollController::Animate(double) {
   }
   if (autoscroll_type_ != kNoAutoscroll && autoscroll_layout_object_) {
     page_->GetChromeClient().ScheduleAnimation(
-        autoscroll_layout_object_->GetFrame());
+        autoscroll_layout_object_->GetFrame()->View());
   }
 }
 
 void AutoscrollController::StartAutoscroll() {
   page_->GetChromeClient().ScheduleAnimation(
-      autoscroll_layout_object_->GetFrame());
+      autoscroll_layout_object_->GetFrame()->View());
 }
 
 void AutoscrollController::UpdateMiddleClickAutoscrollState(