Switch the page-capturing machinery to use the new hooks.

third_party/WebKit/public/web/WebMeaningfulLayout.h

Index: third_party/WebKit/public/web/WebMeaningfulLayout.h
diff --git a/third_party/WebKit/public/web/WebMeaningfulLayout.h b/third_party/WebKit/public/web/WebMeaningfulLayout.h
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index 0000000000000000000000000000000000000000..9658aec0b4245b03edf014fa8bcbdebdb4fe920b
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+++ b/third_party/WebKit/public/web/WebMeaningfulLayout.h
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+// Copyright 2015 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.
+
+#ifndef WebMeaningfulLayout_h
+#define WebMeaningfulLayout_h
+
+namespace blink {
+
+enum WebMeaningfulLayout {
+    // Signifies that one of the following things were involved during the layout:
+    // * > 200 text characters
+    // * > 1024 image pixels
+    // * a plugin
+    // * a canvas
+    // An approximation for first layout that resulted in pixels on screen.
+    // Not the best heuristic, and we should replace it with something better.
+    VisuallyNonEmpty,
+    // First layout of a frame immediately after the parsing finished.
+    FinishedParsing,
+    // First layout of a frame immediately after the loading finished.
+    FinishedLoading
+};
+}
+
+#endif