Make points drawn with default paint visible

When no stroke width is set, use 0.5 instead of 0.25 to make
sure the resulting rectangle spans at least one pixel.

Bug: 15455111
Change-Id: Id0a4b6d014c542ffc98b13a032f88ae0ce69b3a1
diff --git a/libs/hwui/PathTessellator.cpp b/libs/hwui/PathTessellator.cpp
index 281ca02..27ef06f 100644
--- a/libs/hwui/PathTessellator.cpp
+++ b/libs/hwui/PathTessellator.cpp
@@ -812,7 +812,7 @@
     // determine point shape
     SkPath path;
     float radius = paintInfo.halfStrokeWidth;
-    if (radius == 0.0f) radius = 0.25f;
+    if (radius == 0.0f) radius = 0.5f;
 
     if (paintInfo.cap == SkPaint::kRound_Cap) {
         path.addCircle(0, 0, radius);