converted ConstColorProcessor to SkSL

Bug: skia:
Change-Id: Ic3b18f82c1ab940637fb26dec1cf376dd859b35d
Reviewed-on: https://skia-review.googlesource.com/73720
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/gpu/effects/GrRectBlurEffect.cpp b/src/gpu/effects/GrRectBlurEffect.cpp
index 940674e..573c131 100644
--- a/src/gpu/effects/GrRectBlurEffect.cpp
+++ b/src/gpu/effects/GrRectBlurEffect.cpp
@@ -124,7 +124,7 @@
 
         pdman.set1f(profileSize, SkScalarCeilToScalar(6 * sigma));
     }
-    bool highPrecision;
+    bool highPrecision = false;
     UniformHandle fProxyRectHalfVar;
     UniformHandle fProxyRectFloatVar;
     UniformHandle fProfileSizeVar;