Create a new RenderFrameHost per child frame when --site-per-process is enabled.

content/browser/renderer_host/render_frame_message_filter.cc

Index: content/browser/renderer_host/render_frame_message_filter.cc
diff --git a/content/browser/renderer_host/render_frame_message_filter.cc b/content/browser/renderer_host/render_frame_message_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..349bacb23705257422919dc88a08f44065a74093
--- /dev/null
+++ b/content/browser/renderer_host/render_frame_message_filter.cc
@@ -0,0 +1,67 @@
+// Copyright (c) 2012 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/renderer_host/render_frame_message_filter.h"
+
+#include "content/browser/renderer_host/render_frame_host_impl.h"
+#include "content/browser/renderer_host/render_widget_helper.h"
+#include "content/common/frame_messages.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+namespace {
+
+void CreateChildFrameOnUI(int process_id,
+                          int parent_render_frame_id,
+                          int64 parent_frame_id,
+                          int64 frame_id,
+                          const std::string& frame_name,
+                          int new_render_frame_id) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  RenderFrameHostImpl* render_frame_host =
+      RenderFrameHostImpl::FromID(process_id, parent_render_frame_id);
+  // Handles the RenderFrameHost being deleted on the UI thread while
+  // processing a subframe creation message.
+  if (render_frame_host)
+    render_frame_host->CreateChildFrameHost(new_render_frame_id,
+                                            parent_frame_id, frame_id,
+                                            frame_name);
+}
+
+}  // namespace
+
+RenderFrameMessageFilter::RenderFrameMessageFilter(
+    int render_process_id,
+    RenderWidgetHelper* render_widget_helper)
+    : render_process_id_(render_process_id),
+      render_widget_helper_(render_widget_helper) {
+}
+
+bool RenderFrameMessageFilter::OnMessageReceived(const IPC::Message& message,
+                                                 bool* message_was_ok) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(RenderFrameMessageFilter, message, *message_was_ok)
+    IPC_MESSAGE_HANDLER(FrameHostMsg_CreateChildFrame, OnCreateChildFrame)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+
+  return handled;
+}
+
+void RenderFrameMessageFilter::OnCreateChildFrame(
+    int parent_render_frame_id,
+    int64 parent_frame_id,
+    int64 frame_id,
+    const std::string& frame_name,
+    int* new_render_frame_id) {
+  *new_render_frame_id = render_widget_helper_->GetNextRoutingID();
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::Bind(&CreateChildFrameOnUI, render_process_id_,
+                 parent_render_frame_id, parent_frame_id, frame_id, frame_name,
+                 *new_render_frame_id));
+}
+
+}  // namespace content