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

src/core/SkSpriteBlitter_ARGB32.cpp

Index: src/core/SkSpriteBlitter_ARGB32.cpp
diff --git a/src/core/SkSpriteBlitter_ARGB32.cpp b/src/core/SkSpriteBlitter_ARGB32.cpp
index 93885996ea4e7a1490c7862028440cf952d924b8..eb041cf3156d646ede7a6c27125b6d06a79f48d8 100644
--- a/src/core/SkSpriteBlitter_ARGB32.cpp
+++ b/src/core/SkSpriteBlitter_ARGB32.cpp
@@ -254,7 +254,7 @@ public:
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkSpriteBlitter* SkSpriteBlitter::ChooseL32(const SkPixmap& source, const SkPaint& paint,
+SkSpriteBlitter* SkSpriteBlitter::ChooseLegacy32(const SkPixmap& source, const SkPaint& paint,
                                             SkTBlitterAllocator* allocator) {
     SkASSERT(allocator != nullptr);