Ensure RemoteViewportIntersection rect persists across frame navigations

content/browser/frame_host/cross_process_frame_connector.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_hittest.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/surface_utils.h"
@@ skipping 228 matching lines @@
 }
 
 void CrossProcessFrameConnector::OnFrameRectChanged(
     const gfx::Rect& frame_rect) {
   if (!frame_rect.size().IsEmpty())
     SetRect(frame_rect);
 }
 
 void CrossProcessFrameConnector::OnUpdateViewportIntersection(
     const gfx::Rect& viewport_intersection) {
+  viewport_intersection_rect_ = viewport_intersection;
   if (view_)
     view_->UpdateViewportIntersection(viewport_intersection);
 }
 
 void CrossProcessFrameConnector::OnVisibilityChanged(bool visible) {
   if (!view_)
     return;
 
   // If there is an inner WebContents, it should be notified of the change in
   // the visibility. The Show/Hide methods will not be called if an inner
@@ skipping 76 matching lines @@
 
   if (parent) {
     return static_cast<RenderWidgetHostViewBase*>(
         parent->current_frame_host()->GetView());
   }
 
   return nullptr;
 }
 
 }  // namespace content