New GM that exercises gamma-correctness in various parts of the pipeline.

src/core/SkSpriteBlitter_ARGB32.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkSpriteBlitter.h"
 #include "SkBlitRow.h"
 #include "SkColorFilter.h"
@@ skipping 236 matching lines @@
         do {
             srcover_row(dst, src, width);
             dst = (SkPMColor* SK_RESTRICT)((char*)dst + dstRB);
             src = (const SkPMColor16* SK_RESTRICT)((const char*)src + srcRB);
         } while (--height != 0);
     }
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkSpriteBlitter* SkSpriteBlitter::ChooseL32(const SkPixmap& source, const SkPaint& paint,
+SkSpriteBlitter* SkSpriteBlitter::ChooseLegacy32(const SkPixmap& source, const SkPaint& paint,
                                             SkTBlitterAllocator* allocator) {
     SkASSERT(allocator != nullptr);
 
     if (paint.getMaskFilter() != nullptr) {
         return nullptr;
     }
 
     U8CPU       alpha = paint.getAlpha();
     SkXfermode* xfermode = paint.getXfermode();
     SkColorFilter* filter = paint.getColorFilter();
@@ skipping 21 matching lines @@
             } else {
                 // this can handle alpha, but not xfermode or filter
                 blitter = allocator->createT<Sprite_D32_S32>(source, alpha);
             }
             break;
         default:
             break;
     }
     return blitter;
 }