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/RecordingXfermodeTest.cpp b/tests/RecordingXfermodeTest.cpp
index db4262c..20dccc6 100644
--- a/tests/RecordingXfermodeTest.cpp
+++ b/tests/RecordingXfermodeTest.cpp
@@ -7,6 +7,7 @@
 
 #include "Test.h"
 
+#include "../include/core/SkBitmap.h"
 #include "../include/core/SkCanvas.h"
 #include "../include/core/SkPicture.h"
 #include "../include/core/SkStream.h"