Move guest view container message routing out of content/.

components/guest_view/renderer/guest_view_container_dispatcher.cc

+// Copyright 2015 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 "components/guest_view/renderer/guest_view_container_dispatcher.h"
+
+#include "components/guest_view/common/guest_view_constants.h"
+#include "components/guest_view/renderer/guest_view_container.h"
+#include "ipc/ipc_message_macros.h"
+
+namespace guest_view {
+
+GuestViewContainerDispatcher::GuestViewContainerDispatcher() {
+}
+
+GuestViewContainerDispatcher::~GuestViewContainerDispatcher() {
+}
+
+bool GuestViewContainerDispatcher::HandlesMessage(const IPC::Message& message) {
+  return IPC_MESSAGE_CLASS(message) == GuestViewMsgStart;
+}
+
+bool GuestViewContainerDispatcher::OnControlMessageReceived(
+    const IPC::Message& message) {
+  if (!HandlesMessage(message))
+    return false;
+
+  int element_instance_id = kInstanceIDNone;
+  PickleIterator iter(message);
+  bool success = iter.ReadInt(&element_instance_id);
+  DCHECK(success);
+
+  auto* container = GuestViewContainer::FromID(element_instance_id);
+  if (!container)
+    return false;
+
+  return container->OnMessageReceived(message);
+}
+
+}  // namespace guest_view