Implements frame sniffer to watch iframe loading state.

chrome/renderer/frame_sniffer.cc

Index: chrome/renderer/frame_sniffer.cc
diff --git a/chrome/renderer/frame_sniffer.cc b/chrome/renderer/frame_sniffer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e026b3981385ca3cb9a3b551b96e23b094a3b420
--- /dev/null
+++ b/chrome/renderer/frame_sniffer.cc
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+// 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 "chrome/renderer/frame_sniffer.h"
+
+#include "base/logging.h"
+#include "chrome/common/render_messages.h"
+#include "content/common/view_messages.h"
+#include "content/renderer/navigation_state.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 ChromeViewHostMsg_FrameLoadingError(routing_id(), -error.reason));
+}
+
+bool FrameSniffer::ShouldSniffFrame(WebKit::WebFrame* frame) {
+  return frame->name() == frame_name_;
+}