Add --dump-line-box-trees parameter to content_shell.

components/test_runner/web_test_proxy.h

 // Copyright 2014 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 COMPONENTS_TEST_RUNNER_WEB_TEST_PROXY_H_
 #define COMPONENTS_TEST_RUNNER_WEB_TEST_PROXY_H_
 
 #include <deque>
 #include <map>
 #include <string>
@@ skipping 93 matching lines @@
       blink::WebColorChooserClient* client,
       const blink::WebColor& color,
       const blink::WebVector<blink::WebColorSuggestion>& suggestions);
   bool RunFileChooser(const blink::WebFileChooserParams& params,
                       blink::WebFileChooserCompletion* completion);
   void ShowValidationMessage(const base::string16& message,
                              const base::string16& sub_message);
   void HideValidationMessage();
   void MoveValidationMessage(const blink::WebRect& anchor_in_root_view);
 
-  std::string CaptureTree(bool debug_render_tree);
+  std::string CaptureTree(bool debug_render_tree, bool dump_line_box_trees);
   void CapturePixelsForPrinting(
       const base::Callback<void(const SkBitmap&)>& callback);
   void CopyImageAtAndCapturePixels(
       int x, int y, const base::Callback<void(const SkBitmap&)>& callback);
   void CapturePixelsAsync(
       const base::Callback<void(const SkBitmap&)>& callback);
 
   void SetLogConsoleOutput(bool enabled);
 
   void DidOpenChooser();
@@ skipping 277 matching lines @@
 
  private:
   virtual ~WebTestProxy() {}
 
   DISALLOW_COPY_AND_ASSIGN(WebTestProxy);
 };
 
 }  // namespace test_runner
 
 #endif  // COMPONENTS_TEST_RUNNER_WEB_TEST_PROXY_H_