Add option --dump-render-tree to content_shell to dump the render tree as text.

content/shell/shell.h

 // Copyright (c) 2012 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 CONTENT_SHELL_SHELL_H_
 #define CONTENT_SHELL_SHELL_H_
 
 #pragma once
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/string_piece.h"
 #include "content/public/browser/web_contents_delegate.h"
+#include "content/public/browser/web_contents_observer.h"
 #include "ui/gfx/native_widget_types.h"
 
 #if defined(OS_LINUX)
 #include <gtk/gtk.h>
 #include "ui/base/gtk/gtk_signal.h"
 
 typedef struct _GtkToolItem GtkToolItem;
 #endif
 
 class GURL;
 class TabContents;
 
 namespace content {
 class BrowserContext;
 class SiteInstance;
 
 // This represents one window of the Content Shell, i.e. all the UI including
 // buttons and url bar, as well as the web content area.
-class Shell : public WebContentsDelegate {
+class Shell : public WebContentsDelegate,
+              public WebContentsObserver {
  public:
   virtual ~Shell();
 
   void LoadURL(const GURL& url);
   void GoBackOrForward(int offset);
   void Reload();
   void Stop();
   void UpdateNavigationControls();
 
   // Do one time initialization at application startup.
@@ skipping 19 matching lines @@
   void URLEntered(std::string url_string);
 #endif
 
  private:
   enum UIControl {
     BACK_BUTTON,
     FORWARD_BUTTON,
     STOP_BUTTON
   };
 
-  Shell();
+  explicit Shell(TabContents* tab_contents);
 
   // Helper to create a new Shell given a newly created TabContents.
   static Shell* CreateShell(TabContents* tab_contents);
 
   // All the methods that begin with Platform need to be implemented by the
   // platform specific Shell implementation.
   // Called from the destructor to let each platform do any necessary cleanup.
   void PlatformCleanUp();
   // Creates the main window GUI.
   void PlatformCreateWindow(int width, int height);
@@ skipping 15 matching lines @@
   // content::WebContentsDelegate
   virtual void LoadingStateChanged(WebContents* source) OVERRIDE;
   virtual void WebContentsCreated(WebContents* source_contents,
                                   int64 source_frame_id,
                                   const GURL& target_url,
                                   WebContents* new_contents) OVERRIDE;
   virtual void DidNavigateMainFramePostCommit(WebContents* tab) OVERRIDE;
   virtual void UpdatePreferredSize(WebContents* source,
                                    const gfx::Size& pref_size) OVERRIDE;
 
+  // content::WebContentsObserver
+  virtual void DidFinishLoad(int64 frame_id,
+                             const GURL& validated_url,
+                             bool is_main_frame) OVERRIDE;
+
 #if defined(OS_WIN)
   static ATOM RegisterWindowClass();
   static LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
   static LRESULT CALLBACK EditWndProc(HWND, UINT, WPARAM, LPARAM);
 #elif defined(OS_LINUX)
   CHROMEGTK_CALLBACK_0(Shell, void, OnBackButtonClicked);
   CHROMEGTK_CALLBACK_0(Shell, void, OnForwardButtonClicked);
   CHROMEGTK_CALLBACK_0(Shell, void, OnReloadButtonClicked);
   CHROMEGTK_CALLBACK_0(Shell, void, OnStopButtonClicked);
   CHROMEGTK_CALLBACK_0(Shell, void, OnURLEntryActivate);
@@ skipping 29 matching lines @@
 #endif
 
   // A container of all the open windows. We use a vector so we can keep track
   // of ordering.
   static std::vector<Shell*> windows_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_H_