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

Source/web/tests/WebFrameTest.cpp

Index: Source/web/tests/WebFrameTest.cpp
diff --git a/Source/web/tests/WebFrameTest.cpp b/Source/web/tests/WebFrameTest.cpp
index 40db38089e70c58f9c083948f211ae0d93bf138b..ccbe015cf3c76e75956f97e136536b61717cd04c 100644
--- a/Source/web/tests/WebFrameTest.cpp
+++ b/Source/web/tests/WebFrameTest.cpp
@@ -5403,4 +5403,29 @@ TEST_F(WebFrameTest, HasVisibleContentOnHiddenFrames)
     }
 }
 
+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