Implements frame sniffer to watch iframe loading state.

content/renderer/frame_sniffer.cc

Index: content/renderer/frame_sniffer.cc
diff --git a/content/renderer/frame_sniffer.cc b/content/renderer/frame_sniffer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a86525750beba1890d2ca4f7857da18ebf522bf3
--- /dev/null
+++ b/content/renderer/frame_sniffer.cc
@@ -0,0 +1,30 @@
+// Copyright (c) 2011 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/renderer/frame_sniffer.h"
+
+
+#include "base/logging.h"
+#include "content/common/view_messages.h"
+#include "content/renderer/navigation_state.h"
+#include "content/renderer/render_view.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebURLError.h"
+FrameSniffer::FrameSniffer(RenderView* render_view, const string16 &frame_name)
+    : RenderViewObserver(render_view), frame_name_(frame_name) {
+}
+
+FrameSniffer::~FrameSniffer() {
+}
+
+void FrameSniffer::DidFailProvisionalLoad(WebKit::WebFrame* frame,
+                                    const WebKit::WebURLError& error) {
+  if (!ShouldSniffFrame(frame))
+    return;
+  Send(new ViewHostMsg_FrameLoadingError(routing_id(), -error.reason));
+}
+
+bool FrameSniffer::ShouldSniffFrame(WebKit::WebFrame* frame) {
+  return frame->name() == frame_name_;
+}