Detect <link rel='manifest'> and notify embedder.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
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 TEST_F(WebFrameTest, HasVisibleContentOnHiddenFrames)
 {
     registerMockedHttpURLLoad("hidden_frames.html");
     FrameTestHelpers::WebViewHelper webViewHelper;
     WebViewImpl* webViewImpl = webViewHelper.initializeAndLoad(m_baseURL + "hidden_frames.html");
     for (WebFrame* frame = webViewImpl->mainFrameImpl()->traverseNext(false); frame; frame = frame->traverseNext(false)) {
         EXPECT_FALSE(frame->hasVisibleContent());
     }
 }
 
+class ManifestChangeWebFrameClient : public FrameTestHelpers::TestWebFrameClient {
+public:
+    ManifestChangeWebFrameClient() : m_manifestChangeCount(0) { }
+    virtual void didChangeManifest(WebLocalFrame*) OVERRIDE
+    {
+        ++m_manifestChangeCount;
+    }
+
+    int manifestChangeCount() { return m_manifestChangeCount; }
+
+private:
+    int m_manifestChangeCount;
+};
+
+TEST_F(WebFrameTest, NotifyManifestChange)
+{
+    registerMockedHttpURLLoad("link-manifest-change.html");
+
+    ManifestChangeWebFrameClient webFrameClient;
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    webViewHelper.initializeAndLoad(m_baseURL + "link-manifest-change.html", true, &webFrameClient);
+
+    EXPECT_EQ(14, webFrameClient.manifestChangeCount());
+}
+
 } // namespace