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

views/examples/example_base.cc

Index: views/examples/example_base.cc
diff --git a/views/examples/example_base.cc b/views/examples/example_base.cc
index 70185b5d23202aced0fb550ee8fe879e1d25b391..149ea52ef1c545f27950edaaf45adb26aaeafb1e 100644
--- a/views/examples/example_base.cc
+++ b/views/examples/example_base.cc
@@ -10,9 +10,52 @@
 #include "base/string_util.h"
 #include "views/controls/button/text_button.h"
 #include "views/controls/tabbed_pane/tabbed_pane.h"
+#include "views/examples/examples_main.h"
+
+namespace {
+
+using views::View;
+
+// Some of GTK based view classes require WidgetGTK in the view
+// parent chain. This class is used to defer the creation of such
+// views until a WidgetGTK is added to the view hierarchy.
+class ContainerView : public View {
+ public:
+  explicit ContainerView(examples::ExampleBase* base)
+      : example_view_created_(false),
+        example_base_(base) {
+  }
+
+ protected:
+  // views::View overrides:
+  virtual void ViewHierarchyChanged(bool is_add, View* parent, View* child) {
+    View::ViewHierarchyChanged(is_add, parent, child);
+    // We're not using child == this because a Widget may not be
+    // availalbe when this is added to the hierarchy.
+    if (is_add && GetWidget() && !example_view_created_) {
+      example_view_created_ = true;
+      example_base_->CreateExampleView(this);
+    }
+  }
+
+ private:
+  // true if the example view has already been created, or false otherwise.
+  bool example_view_created_;
+
+  examples::ExampleBase* example_base_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContainerView);
+};
+
+}  // namespace
 
 namespace examples {
 
+ExampleBase::ExampleBase(ExamplesMain* main)
+    : main_(main) {
+  container_ = new ContainerView(this);
+}
+
 // Prints a message in the status area, at the bottom of the window.
 void ExampleBase::PrintStatus(const wchar_t* format, ...) {
   va_list ap;