Added (color=8888|f16|srgb) option to gpu configurations, along with gpuf16 and gpusrgb predefined configs. Runs the gpu backend in gamma-correct mode (with either FP16 linear or sRGB 8888 frambuffers).

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1750383002

Committed: https://skia.googlesource.com/skia/+/a6f58194733c1c50e4fe5f98585e42344f29b6f0

Review URL: https://codereview.chromium.org/1750383002
diff --git a/dm/DMSrcSink.h b/dm/DMSrcSink.h
index b6ee5f0..1a56e81 100644
--- a/dm/DMSrcSink.h
+++ b/dm/DMSrcSink.h
@@ -233,7 +233,8 @@
 class GPUSink : public Sink {
 public:
     GPUSink(GrContextFactory::GLContextType, GrContextFactory::GLContextOptions,
-            int samples, bool diText, bool threaded);
+            int samples, bool diText, SkColorType colorType, SkColorProfileType profileType,
+            bool threaded);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     bool serial() const override { return !fThreaded; }
@@ -244,6 +245,8 @@
     GrContextFactory::GLContextOptions fContextOptions;
     int                                fSampleCount;
     bool                               fUseDIText;
+    SkColorType                        fColorType;
+    SkColorProfileType                 fProfileType;
     bool                               fThreaded;
 };