Ensure RemoteViewportIntersection rect persists across frame navigations

third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp

Index: third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
index c30f0442862025bbce8c46bf6b49d547409832da..98063fcc63a0f92eb7eb372293a1b4440d15af37 100644
--- a/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
+++ b/third_party/WebKit/Source/web/WebFrameWidgetImpl.cpp
@@ -766,8 +766,8 @@ void WebFrameWidgetImpl::SetRemoteViewportIntersection(
   // Remote viewports are only applicable to local frames with remote ancestors.
   DCHECK(local_root_->Parent() && local_root_->Parent()->IsWebRemoteFrame());
 
-  if (local_root_->GetFrameView()) {
-    local_root_->GetFrameView()->SetViewportIntersectionFromParent(
+  if (local_root_->GetFrame()) {

[dcheng, 2017/05/30 22:14:26]

Hmm... I wonder if we can get this when there's no attached frame. Do you mind
poking at this in a followup and trying to DCHECK() these instead?

[kenrb, 2017/05/31 01:37:29]

I'll take a look.

+    local_root_->GetFrame()->SetViewportIntersectionFromParent(
         viewport_intersection);
   }
 }