Allow MimeHandlerViewGuest be embedded inside OOPIFs

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc

Index: extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
diff --git a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
index 8da2fac73794c1f63072b9e68cdd7835f9af7643..beffab0f35d3b48f622eabba318f060af725e53f 100644
--- a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
+++ b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
@@ -12,8 +12,11 @@
 #include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_widget_host.h"
+#include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/stream_handle.h"
 #include "content/public/browser/stream_info.h"
+#include "content/public/common/child_process_host.h"
 #include "content/public/common/url_constants.h"
 #include "extensions/browser/api/extensions_api_client.h"
 #include "extensions/browser/api/mime_handler_private/mime_handler_private.h"
@@ -76,8 +79,10 @@ GuestViewBase* MimeHandlerViewGuest::Create(WebContents* owner_web_contents) {
 
 MimeHandlerViewGuest::MimeHandlerViewGuest(WebContents* owner_web_contents)
     : GuestView<MimeHandlerViewGuest>(owner_web_contents),
-      delegate_(ExtensionsAPIClient::Get()->CreateMimeHandlerViewGuestDelegate(
-          this)) {}
+      delegate_(
+          ExtensionsAPIClient::Get()->CreateMimeHandlerViewGuestDelegate(this)),
+      embedder_frame_process_id_(content::ChildProcessHost::kInvalidUniqueID),
+      embedder_frame_routing_id_(MSG_ROUTING_NONE) {}
 
 MimeHandlerViewGuest::~MimeHandlerViewGuest() {
 }
@@ -86,6 +91,20 @@ bool MimeHandlerViewGuest::CanUseCrossProcessFrames() {
   return false;
 }
 
+content::RenderFrameHost* MimeHandlerViewGuest::GetEmbedderFrame() {
+  DCHECK_NE(embedder_frame_routing_id_, MSG_ROUTING_NONE);
+  return content::RenderFrameHost::FromID(embedder_frame_process_id_,
+                                          embedder_frame_routing_id_);
+}
+
+void MimeHandlerViewGuest::SetEmbedderFrame(int process_id, int routing_id) {
+  DCHECK_NE(routing_id, MSG_ROUTING_NONE);
+  DCHECK_EQ(embedder_frame_routing_id_, MSG_ROUTING_NONE);
+
+  embedder_frame_process_id_ = process_id;
+  embedder_frame_routing_id_ = routing_id;
+}
+
 const char* MimeHandlerViewGuest::GetAPINamespace() const {
   return "mimeHandlerViewGuestInternal";
 }
@@ -244,7 +263,7 @@ void MimeHandlerViewGuest::DocumentOnLoadCompletedInMainFrame() {
   // Assume the embedder WebContents is valid here.
   DCHECK(embedder_web_contents());
 
-  embedder_web_contents()->Send(
+  GetEmbedderFrame()->GetView()->GetRenderWidgetHost()->Send(
       new ExtensionsGuestViewMsg_MimeHandlerViewGuestOnLoadCompleted(
           element_instance_id()));
 }