Fixed view example. It was failing because some of view classes requires WidgetGTK in

views/examples/example_base.h

 // Copyright (c) 2009 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 VIEWS_EXAMPLES_EXAMPLE_BASE_H_
 #define VIEWS_EXAMPLES_EXAMPLE_BASE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
-#include "views/examples/examples_main.h"
-#include "views/window/window_delegate.h"
 
 namespace views {
 class View;
 }  // namespace views
 
 namespace examples {
 
+class ExamplesMain;
+
 class ExampleBase {
+ public:
+  // Returns the view containing this example controls.
+  // This view is added as a tab to the example application.
+  views::View* GetExampleView() {
+    return container_;
+  }
+
+  // Sub-classes should creates and add the views to the given parent.
+  virtual void CreateExampleView(views::View* parent) = 0;
+
  protected:
-  explicit ExampleBase(ExamplesMain* main) : main_(main) {}
+  explicit ExampleBase(ExamplesMain* main);
   virtual ~ExampleBase() {}
 
   // Sub-classes should return the name of this test.
   // It is used as the title of the tab displaying this test's controls.
   virtual std::wstring GetExampleTitle() = 0;
 
-  // Sub-classes should return the view containing this example controls.
-  // This view is added as a tab to the example application.
-  virtual views::View* GetExampleView() = 0;
-
   // Prints a message in the status area, at the bottom of the window.
   void PrintStatus(const wchar_t* format, ...);
 
   // Converts an integer/boolean to wchat "on"/"off".
   static const wchar_t* IntToOnOff(int value) {
     return value ? L"on" : L"off";
   }
 
  private:
   // The runner actually running this test.
   ExamplesMain* main_;
 
+  // The view containing example views.
+  views::View* container_;
+
   DISALLOW_COPY_AND_ASSIGN(ExampleBase);
 };
 
 }  // namespace examples
 
 #endif  // VIEWS_EXAMPLES_EXAMPLE_BASE_H_