Rename circular_arcs_circular_arcs_fill to circular_arcs_fill.

Also fix issue with second paint's alpha getting overwritten.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2265643002

Review-Url: https://codereview.chromium.org/2265643002
diff --git a/gm/circulararcs.cpp b/gm/circulararcs.cpp
index 7bc40de..7214b7d 100644
--- a/gm/circulararcs.cpp
+++ b/gm/circulararcs.cpp
@@ -26,10 +26,11 @@
         p0.setAntiAlias(aa);
         // Set a reasonable stroke width that configureStyle can override.
         p0.setStrokeWidth(15.f);
-        // Use alpha so we see magenta on overlap between arc and its complement.
-        p0.setAlpha(100);
         SkPaint p1 = p0;
         p1.setColor(SK_ColorBLUE);
+        // Use alpha so we see magenta on overlap between arc and its complement.
+        p0.setAlpha(100);
+        p1.setAlpha(100);
         configureStyle(&p0);
         configureStyle(&p1);
 
@@ -64,7 +65,7 @@
 
 #define DEF_ARC_GM(name) DEF_SIMPLE_GM(circular_arcs_##name, canvas, kW, kH)
 
-DEF_ARC_GM(circular_arcs_fill) {
+DEF_ARC_GM(fill) {
     auto setFill = [] (SkPaint*p) { p->setStyle(SkPaint::kFill_Style); };
     draw_arcs(canvas, setFill);
 }