Only use fake gamma with linear devices.

src/gpu/text/GrAtlasTextBlob.h

Index: src/gpu/text/GrAtlasTextBlob.h
diff --git a/src/gpu/text/GrAtlasTextBlob.h b/src/gpu/text/GrAtlasTextBlob.h
index 8b175c8e96042e536b7ea290700012d4246692f3..e662d59fa6a17882451ee0253aea6a5ffc8377f1 100644
--- a/src/gpu/text/GrAtlasTextBlob.h
+++ b/src/gpu/text/GrAtlasTextBlob.h
@@ -148,9 +148,9 @@ public:
 
     SkGlyphCache* setupCache(int runIndex,
                              const SkSurfaceProps& props,
+                             SkPaint::FakeGamma fakeGamma,
                              const SkPaint& skPaint,
-                             const SkMatrix* viewMatrix,
-                             bool noGamma);
+                             const SkMatrix* viewMatrix);
 
     // Appends a glyph to the blob.  If the glyph is too large, the glyph will be appended
     // as a path.