IWYU for gms.

This almost gets gms to be iwyu clean. The last bit is around gm.cpp
and the tracing framework and its use of atomic. Will also need a way
of keeping things from regressing, which is difficult due to needing to
do this outside-in.

Change-Id: I1393531e99da8b0f1a29f55c53c86d53f459af7d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/211593
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
diff --git a/gm/complexclip.cpp b/gm/complexclip.cpp
index b3c4dc7..64922b6 100644
--- a/gm/complexclip.cpp
+++ b/gm/complexclip.cpp
@@ -7,10 +7,23 @@
 
 #include "gm/gm.h"
 #include "include/core/SkCanvas.h"
+#include "include/core/SkClipOp.h"
+#include "include/core/SkColor.h"
 #include "include/core/SkFont.h"
+#include "include/core/SkFontTypes.h"
+#include "include/core/SkPaint.h"
 #include "include/core/SkPath.h"
+#include "include/core/SkRect.h"
+#include "include/core/SkScalar.h"
+#include "include/core/SkSize.h"
+#include "include/core/SkString.h"
+#include "include/core/SkTypeface.h"
+#include "include/core/SkTypes.h"
+#include "src/core/SkClipOpPriv.h"
 #include "tools/ToolUtils.h"
 
+#include <string.h>
+
 namespace skiagm {
 
 constexpr SkColor gPathColor = SK_ColorBLACK;