Require sRGB write control for sRGB support. Add flag to GrPaint to suppress linear -> sRGB convers…

src/gpu/GrPipeline.cpp

Index: src/gpu/GrPipeline.cpp
diff --git a/src/gpu/GrPipeline.cpp b/src/gpu/GrPipeline.cpp
index 8e542d2a70697ca9d5fba96f714e74993b5b3516..e3c48649805dfff9409a0392414ae30e845caa10 100644
--- a/src/gpu/GrPipeline.cpp
+++ b/src/gpu/GrPipeline.cpp
@@ -81,6 +81,9 @@ GrPipeline* GrPipeline::CreateAt(void* memory, const CreateArgs& args,
     if (builder.snapVerticesToPixelCenters()) {
         pipeline->fFlags |= kSnapVertices_Flag;
     }
+    if (builder.getDisableOutputConversionToSRGB()) {
+        pipeline->fFlags |= kDisableOutputConversionToSRGB_Flag;
+    }
 
     int firstColorProcessorIdx = args.fOpts.fColorPOI.firstEffectiveProcessorIndex();