Fix cases of variable shadowing in /samplecode/.

If we manage to fix all the existing cases of variable shadowing, we
could enable -Wshadow.

Change-Id: I4c476668a83a0054fe8624d5ffa650db202ba810
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/438376
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>
diff --git a/samplecode/SampleVariableWidthStroker.cpp b/samplecode/SampleVariableWidthStroker.cpp
index ab2117a..7d9a352 100644
--- a/samplecode/SampleVariableWidthStroker.cpp
+++ b/samplecode/SampleVariableWidthStroker.cpp
@@ -463,7 +463,7 @@
      * TODO: no reason this needs to return a vector of quads, can just append to the path
      */
     std::vector<PathSegment> strokeSegment(const PathSegment& seg,
-                                           const ScalarBezCurve& distFnc) const;
+                                           const ScalarBezCurve& distanceFunc) const;
 
     /** Adds an endcap to fOuter */
     enum class CapLocation { Start, End };
@@ -636,7 +636,7 @@
 }
 
 std::vector<SkVarWidthStroker::PathSegment> SkVarWidthStroker::strokeSegment(
-        const PathSegment& seg, const ScalarBezCurve& distFnc) const {
+        const PathSegment& seg, const ScalarBezCurve& distanceFunc) const {
     // Work item for the recursive splitting stack.
     struct Item {
         PathSegment fSeg;
@@ -659,7 +659,7 @@
 
     // Push the initial segment and distance function
     std::stack<Item> stack;
-    stack.push(Item(seg, distFnc, ScalarBezCurve::Mul(distFnc, distFnc)));
+    stack.push(Item(seg, distanceFunc, ScalarBezCurve::Mul(distanceFunc, distanceFunc)));
 
     std::vector<PathSegment> result;
     constexpr int kMaxIters = 5000; /** TODO: this is completely arbitrary */