Cleanup some sRGB TODOs, mostly around setting GrPaint flags correctly

gm/constcolorprocessor.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 // This test only works with the GPU backend.
 
 #include "gm.h"
@@ skipping 81 matching lines @@
                     // rect to draw
                     SkRect renderRect = SkRect::MakeXYWH(0, 0, kRectSize, kRectSize);
 
                     GrPaint grPaint;
                     SkPaint skPaint;
                     if (paintType >= SK_ARRAY_COUNT(kPaintColors)) {
                         skPaint.setShader(fShader);
                     } else {
                         skPaint.setColor(kPaintColors[paintType]);
                     }
-                    // SRGBTODO: No sRGB inputs allowed here?
                     SkAssertResult(SkPaintToGrPaint(context, drawContext, skPaint, viewMatrix,
                                                     &grPaint));
 
                     GrConstColorProcessor::InputMode mode = (GrConstColorProcessor::InputMode) m;
                     GrColor color = kColors[procColor];
                     sk_sp<GrFragmentProcessor> fp(GrConstColorProcessor::Make(color, mode));
 
                     grPaint.addColorFragmentProcessor(std::move(fp));
 
                     SkAutoTUnref<GrDrawBatch> batch(
@@ skipping 67 matching lines @@
     static constexpr int            kWidth  = 820;
     static constexpr int            kHeight = 500;
 
     typedef GM INHERITED;
 };
 
 DEF_GM(return new ConstColorProcessor;)
 }
 
 #endif