move files out of private, and fix up callers to IWYU

Realized that a pending CL needed to add (yet another) private type to SkRecords.h, but w/o this CL I'd be forced to move that header also into private. This change frees us up to not have transitive exposure for types that need to be recorded.

Bug: skia:
Change-Id: Id79f1c2e44ba85e063c1360cf96c92de6397ca2b
Reviewed-on: https://skia-review.googlesource.com/17031
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
diff --git a/tests/ImageIsOpaqueTest.cpp b/tests/ImageIsOpaqueTest.cpp
index 81f1d76..bf3dea6 100644
--- a/tests/ImageIsOpaqueTest.cpp
+++ b/tests/ImageIsOpaqueTest.cpp
@@ -12,6 +12,7 @@
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #endif
+#include "SkCanvas.h"
 #include "SkColorSpace_Base.h"
 #include "SkImage.h"
 #include "SkSurface.h"