Image filters: force near-zero floating point parameters to zero.

include/core/SkScalar.h

Index: include/core/SkScalar.h
diff --git a/include/core/SkScalar.h b/include/core/SkScalar.h
index 922840fd1af52bb90f43a00e920e9cc008e00da7..806829c681d7234f95f0bf2e18bb1758bea89303 100644
--- a/include/core/SkScalar.h
+++ b/include/core/SkScalar.h
@@ -228,6 +228,11 @@ static inline bool SkScalarNearlyEqual(SkScalar x, SkScalar y,
     return SkScalarAbs(x-y) <= tolerance;
 }
 
+static inline SkScalar SkScalarNormalize(SkScalar x)

[reed1, 2016/08/26 17:49:43]

Given this name, should it trigger only when x is denormalized?
SkScalarNearlyZero is some made up value, mostly not related to denormalized
issues.

+{
+    return SkScalarNearlyZero(x) ? 0 : x;
+}
+
 /** Linearly interpolate between A and B, based on t.
     If t is 0, return A
     If t is 1, return B