Allow MimeHandlerViewGuest be embedded inside OOPIFs

content/browser/frame_host/render_widget_host_view_guest.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/render_widget_host_view_guest.h"
 
 #include <utility>
 
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
@@ skipping 583 matching lines @@
   // GestureScrollBegin/End are always consumed by the guest, so we only
   // forward GestureScrollUpdate.
   if (event.type == blink::WebInputEvent::GestureScrollUpdate && not_consumed)
     guest_->ResendEventToEmbedder(event);
 }
 
 bool RenderWidgetHostViewGuest::IsRenderWidgetHostViewGuest() {
   return true;
 }
 
+RenderWidgetHostViewBase* RenderWidgetHostViewGuest::GetOuterView() {
+  return GetOwnerRenderWidgetHostView();
+}
+
 void RenderWidgetHostViewGuest::OnHandleInputEvent(
     RenderWidgetHostImpl* embedder,
     int browser_plugin_instance_id,
     const blink::WebInputEvent* event) {
   // WebMouseWheelEvents go into a queue, and may not be forwarded to the
   // renderer until after this method goes out of scope. Therefore we need to
   // explicitly remove the additional device scale factor from the coordinates
   // before allowing the event to be queued.
   if (IsUseZoomForDSFEnabled() &&
       event->type == blink::WebInputEvent::MouseWheel) {
@@ skipping 75 matching lines @@
         gesture_event.data.scrollUpdate.inertialPhase ==
             blink::WebGestureEvent::MomentumPhase) {
       return;
     }
     host_->ForwardGestureEvent(gesture_event);
     return;
   }
 }
 
 }  // namespace content