Add slides to VulkanViewer

tools/vulkan/viewer/Slide.h

Index: tools/vulkan/viewer/Slide.h
diff --git a/tools/vulkan/viewer/Slide.h b/tools/vulkan/viewer/Slide.h
new file mode 100644
index 0000000000000000000000000000000000000000..742a345f95bde26a8bcf38f6424fea0c99342ba0
--- /dev/null
+++ b/tools/vulkan/viewer/Slide.h
@@ -0,0 +1,28 @@
+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#ifndef Slide_DEFINED
+#define Slide_DEFINED
+
+#include "SkRefCnt.h"
+#include "SkString.h"
+
+class SkCanvas;
+
+class Slide : public SkRefCnt {
+public:
+    virtual ~Slide() {}
+
+    virtual void draw(SkCanvas* canvas) = 0;
+    SkString getName() { return fName; }
+
+protected:
+    SkString    fName;
+};
+
+
+#endif