Make <webview> use out-of-process iframe architecture.

extensions/renderer/dispatcher.cc

Index: extensions/renderer/dispatcher.cc
diff --git a/extensions/renderer/dispatcher.cc b/extensions/renderer/dispatcher.cc
index f210e27e2b0f290c16be549822ba72fb78076561..dcf6176bab2b02e3f0aa02ef3b18c544cc4488da 100644
--- a/extensions/renderer/dispatcher.cc
+++ b/extensions/renderer/dispatcher.cc
@@ -30,6 +30,7 @@
 #include "extensions/common/feature_switch.h"
 #include "extensions/common/features/feature.h"
 #include "extensions/common/features/feature_provider.h"
+#include "extensions/common/guest_view/extensions_guest_view_messages.h"
 #include "extensions/common/manifest.h"
 #include "extensions/common/manifest_constants.h"
 #include "extensions/common/manifest_handlers/background_info.h"
@@ -57,6 +58,7 @@
 #include "extensions/renderer/extension_helper.h"
 #include "extensions/renderer/extensions_renderer_client.h"
 #include "extensions/renderer/file_system_natives.h"
+#include "extensions/renderer/guest_view/extensions_guest_view_container.h"
 #include "extensions/renderer/guest_view/guest_view_internal_custom_bindings.h"
 #include "extensions/renderer/i18n_custom_bindings.h"
 #include "extensions/renderer/id_generator_custom_bindings.h"
@@ -709,6 +711,8 @@ bool Dispatcher::OnControlMessageReceived(const IPC::Message& message) {
   IPC_MESSAGE_HANDLER(ExtensionMsg_ClearTabSpecificPermissions,
                       OnClearTabSpecificPermissions)
   IPC_MESSAGE_HANDLER(ExtensionMsg_UsingWebRequestAPI, OnUsingWebRequestAPI)
+  IPC_MESSAGE_HANDLER_GENERIC(ExtensionsGuestViewMsg_ContentWindowReady,
+                              OnGuestContentWindowReady(message))
   IPC_MESSAGE_FORWARD(ExtensionMsg_WatchPages,
                       content_watcher_.get(),
                       ContentWatcher::OnWatchPages)
@@ -1033,6 +1037,22 @@ void Dispatcher::OnUsingWebRequestAPI(bool webrequest_used) {
   webrequest_used_ = webrequest_used;
 }
 
+void Dispatcher::OnGuestContentWindowReady(const IPC::Message& message) {
+  ExtensionsGuestViewMsg_ContentWindowReady::Param param;
+  bool read_status =
+      ExtensionsGuestViewMsg_ContentWindowReady::Read(&message, &param);
+  DCHECK(read_status);
+  // We do not have a BrowserPluginManager to route this message,
+  // do it here.
+  // TODO(lazyboy): dispatcher.cc is too generic to handle this message, find
+  // a better way to route the message.
+  int element_instance_id = get<0>(param);
+  auto container = static_cast<ExtensionsGuestViewContainer*>(
+      GuestViewContainer::FromID(element_instance_id));
+  DCHECK(container);
+  container->OnMessage(message);
+}
+
 void Dispatcher::OnUserScriptsUpdated(const std::set<HostID>& changed_hosts,
                                       const std::vector<UserScript*>& scripts) {
   UpdateActiveExtensions();