Adding debug SkScalerContext which returns random mask formats

src/fonts/SkRandomScalerContext.h

 /*
- * Copyright 2013 Google Inc.
+ * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
-#ifndef SkGScalerContext_DEFINED
-#define SkGScalerContext_DEFINED
+#ifndef SkRandomScalerContext_DEFINED
+#define SkRandomScalerContext_DEFINED
 
 #include "SkScalerContext.h"
 #include "SkTypeface.h"
 
-class SkGTypeface : public SkTypeface {
+/*
+ * This scaler context is for debug only purposes.  It will 'randomly' but deterministically return
+ * LCD / A8 / BW / RBGA masks based off of the Glyph ID
+ */
+
+class SkRandomTypeface : public SkTypeface {
 public:
-    SkGTypeface(SkTypeface* proxy, const SkPaint&);
-    virtual ~SkGTypeface();
+    SkRandomTypeface(SkTypeface* proxy, const SkPaint&);
+    virtual ~SkRandomTypeface();
 
     SkTypeface* proxy() const { return fProxy; }
     const SkPaint& paint() const { return fPaint; }
 
 protected:
     SkScalerContext* onCreateScalerContext(const SkDescriptor*) const override;
     void onFilterRec(SkScalerContextRec*) const override;
     SkAdvancedTypefaceMetrics* onGetAdvancedTypefaceMetrics(
         PerGlyphInfo,
         const uint32_t* glyphIDs,
@@ skipping 12 matching lines @@
     int onGetTableTags(SkFontTableTag tags[]) const override;
     size_t onGetTableData(SkFontTableTag, size_t offset,
                           size_t length, void* data) const override;
 
 private:
     SkTypeface* fProxy;
     SkPaint     fPaint;
 };
 
 #endif