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/dstreadshuffle.cpp b/gm/dstreadshuffle.cpp
index 4fba80f..d9a2a9f 100644
--- a/gm/dstreadshuffle.cpp
+++ b/gm/dstreadshuffle.cpp
@@ -4,11 +4,26 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 #include "gm/gm.h"
-#include "include/core/SkBitmap.h"
+#include "include/core/SkBlendMode.h"
+#include "include/core/SkCanvas.h"
+#include "include/core/SkColor.h"
+#include "include/core/SkColorSpace.h"
+#include "include/core/SkFont.h"
+#include "include/core/SkImageInfo.h"
+#include "include/core/SkMatrix.h"
+#include "include/core/SkPaint.h"
 #include "include/core/SkPath.h"
-#include "include/core/SkShader.h"
+#include "include/core/SkPoint.h"
+#include "include/core/SkRect.h"
+#include "include/core/SkRefCnt.h"
+#include "include/core/SkScalar.h"
+#include "include/core/SkSize.h"
+#include "include/core/SkString.h"
 #include "include/core/SkSurface.h"
+#include "include/core/SkTypeface.h"
+#include "include/core/SkTypes.h"
 #include "include/utils/SkRandom.h"
 #include "tools/ToolUtils.h"