IWYU for gms starting with 'b'.

Change-Id: I34ded4a4b9c4600eaf801eec121ca851e04a6c23
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/211586
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/gm/bug615686.cpp b/gm/bug615686.cpp
index 35b2e2c..bf930aa 100644
--- a/gm/bug615686.cpp
+++ b/gm/bug615686.cpp
@@ -6,6 +6,8 @@
  */
 
 #include "gm/gm.h"
+#include "include/core/SkCanvas.h"
+#include "include/core/SkPaint.h"
 #include "include/core/SkPath.h"
 
 DEF_SIMPLE_GM(bug615686, canvas, 250, 250) {