move HelloWorld to be a peer of SampleApp

example/HelloWorld.h

Index: example/HelloWorld.h
diff --git a/experimental/SkiaExamples/SkExample.h b/example/HelloWorld.h
similarity index 68%
copy from experimental/SkiaExamples/SkExample.h
copy to example/HelloWorld.h
index 4f4b10be5507dfdca4166c996bddafe5fa099854..e5cde271bfe01c9735cfc5a5f7b272ac2e8f7164 100644
--- a/experimental/SkiaExamples/SkExample.h
+++ b/example/HelloWorld.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2013 Google Inc.
+ * Copyright 2015 Google Inc.
  *
  *
  * Use of this source code is governed by a BSD-style license that can be
@@ -7,45 +7,25 @@
  *
  */
 
-#ifndef SkExample_DEFINED
-#define SkExample_DEFINED
+#ifndef HelloWorld_DEFINED
+#define HelloWorld_DEFINED
 
 #include "SkSurface.h"
 #include "SkWindow.h"
-#include "SkTRegistry.h"
 
 class GrContext;
 struct GrGLInterface;
 class GrRenderTarget;
 class SkCanvas;
-class SkExampleWindow;
 
-class SkExample : SkNoncopyable {
-public:
-    SkExample(SkExampleWindow* window) : fWindow(window) {}
-
-    virtual ~SkExample() {}
-
-    // Your class should override this method to do its thing.
-    virtual void draw(SkCanvas* canvas) = 0;
-
-    SkString getName() { return fName; };
-    // Use this public registry to tell the world about your sample.
-    typedef SkTRegistry<SkExample*(*)(SkExampleWindow*)> Registry;
-
-protected:
-    SkExampleWindow* fWindow;
-    SkString fName;
-};
-
-class SkExampleWindow : public SkOSWindow {
+class HelloWorldWindow : public SkOSWindow {
 public:
     enum DeviceType {
         kRaster_DeviceType,
         kGPU_DeviceType,
     };
-    SkExampleWindow(void* hwnd);
-    virtual ~SkExampleWindow() SK_OVERRIDE;
+    HelloWorldWindow(void* hwnd);
+    virtual ~HelloWorldWindow() SK_OVERRIDE;
 
     // Changes the device type of the object.
     bool setUpBackend();