GrFP can express distance vector field req., program builder declares variable for it

src/gpu/GrPipelineBuilder.h

Index: src/gpu/GrPipelineBuilder.h
diff --git a/src/gpu/GrPipelineBuilder.h b/src/gpu/GrPipelineBuilder.h
index dca7f3603483c7ed802ca24756f6eb8bb41dc5fc..0c33eb344f8ce75442667817f7d25b67e0413c68 100644
--- a/src/gpu/GrPipelineBuilder.h
+++ b/src/gpu/GrPipelineBuilder.h
@@ -221,7 +221,13 @@ public:
          */
         kAllowSRGBInputs_Flag = 0x08,
 
-        kLast_Flag = kAllowSRGBInputs_Flag,
+        /**
+         * Signals that one or more FPs need access to the distance vector field to the nearest
+         * edge
+         */
+        kUsesDistanceVectorField_Flag = 0x10,
+
+        kLast_Flag = kUsesDistanceVectorField_Flag,
     };
 
     bool isHWAntialias() const { return SkToBool(fFlags & kHWAntialias_Flag); }
@@ -231,6 +237,8 @@ public:
         return SkToBool(fFlags & kDisableOutputConversionToSRGB_Flag); }
     bool getAllowSRGBInputs() const {
         return SkToBool(fFlags & kAllowSRGBInputs_Flag); }
+    bool getUsesDistanceVectorField() const {
+        return SkToBool(fFlags & kUsesDistanceVectorField_Flag); }
 
     /**
      * Enable render state settings.