Re-land: Stop using fixed point recs for gradient positioning info

The fixed point gradient records are historical relics.  Instead of
round-tripping through FP, just use the float positions directly.

We can remove the recs completely in a follow-up.

TBR=
Change-Id: Ic3c8e58af6dfa76744799513c9e60af0462014d0
Reviewed-on: https://skia-review.googlesource.com/64680
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/src/shaders/gradients/SkGradientShaderPriv.h b/src/shaders/gradients/SkGradientShaderPriv.h
index 9aad102..983c3ef 100644
--- a/src/shaders/gradients/SkGradientShaderPriv.h
+++ b/src/shaders/gradients/SkGradientShaderPriv.h
@@ -125,6 +125,11 @@
     };
     SkColor             fStorage[(kStorageSize + 3) >> 2];
 public:
+    SkScalar getPos(int i) const {
+        SkASSERT(i < fColorCount);
+        return fOrigPos ? fOrigPos[i] : SkIntToScalar(i) / (fColorCount - 1);
+    }
+
     SkColor*            fOrigColors;   // original colors, before modulation by paint in context.
     SkColor4f*          fOrigColors4f; // original colors, as linear floats
     SkScalar*           fOrigPos;      // original positions