Move Get/SetScrollOffset methods from WebFrame to WebLocalFrame.

third_party/WebKit/Source/core/frame/FullscreenController.cpp

Index: third_party/WebKit/Source/core/frame/FullscreenController.cpp
diff --git a/third_party/WebKit/Source/core/frame/FullscreenController.cpp b/third_party/WebKit/Source/core/frame/FullscreenController.cpp
index faa33269ffc265d517ad728c2e93afbdefbdb75e..b094ed8b32295e81e9002e36ab69cd0f6639f8ac 100644
--- a/third_party/WebKit/Source/core/frame/FullscreenController.cpp
+++ b/third_party/WebKit/Source/core/frame/FullscreenController.cpp
@@ -74,7 +74,7 @@ void FullscreenController::DidEnterFullscreen() {
   UpdatePageScaleConstraints(false);
   web_view_base_->SetPageScaleFactor(1.0f);
   if (web_view_base_->MainFrame()->IsWebLocalFrame())
-    web_view_base_->MainFrame()->SetScrollOffset(WebSize());
+    web_view_base_->MainFrame()->ToWebLocalFrame()->SetScrollOffset(WebSize());

[dcheng, 2017/06/16 23:52:20]

+alexmos, is there anything more we need to do here for OOPIF?

[alexmos, 2017/06/17 00:04:02]

I don't think so - I think these only need to be done when the main frame is
local. 
(With OOPIF fullscreen, this will be called in each renderer, and I think we
only care about clearing and then restoring these to their original values in
the main frame renderer.)

   web_view_base_->SetVisualViewportOffset(FloatPoint());
 
   state_ = State::kFullscreen;
@@ -151,7 +151,7 @@ void FullscreenController::EnterFullscreen(LocalFrame& frame) {
     initial_page_scale_factor_ = web_view_base_->PageScaleFactor();
     initial_scroll_offset_ =
         web_view_base_->MainFrame()->IsWebLocalFrame()
-            ? web_view_base_->MainFrame()->GetScrollOffset()
+            ? web_view_base_->MainFrame()->ToWebLocalFrame()->GetScrollOffset()
             : WebSize();
     initial_visual_viewport_offset_ = web_view_base_->VisualViewportOffset();
     initial_background_color_override_enabled_ =
@@ -259,7 +259,7 @@ void FullscreenController::DidUpdateLayout() {
 
   web_view_base_->SetPageScaleFactor(initial_page_scale_factor_);
   if (web_view_base_->MainFrame()->IsWebLocalFrame()) {
-    web_view_base_->MainFrame()->SetScrollOffset(
+    web_view_base_->MainFrame()->ToWebLocalFrame()->SetScrollOffset(
         WebSize(initial_scroll_offset_));
   }
   web_view_base_->SetVisualViewportOffset(initial_visual_viewport_offset_);