SkMatrix44 is deprecated: use SkM44 instead

Change-Id: I9a269b9c0c3cda29d06827d016db3a3f963a91fd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/283504
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

Author: reed-at-google

RELEASE_NOTES.txt

@@ -8,7 +8,7 @@ Milestone 84
 
   * <insert new release note here>
 
-  * SkCamera.h and all of its contained classes are DEPRECATED.
+  * SkCamera.h and SkMatrix44.h are DEPRECATED.
     Use SkM44 if you want to have 3d transformations.
 
   * Changed Dilate and Erode image filters to take SkScalar for radius instead of int. While

include/core/SkMatrix44.h

@@ -14,6 +14,10 @@
 #include <atomic>
 #include <cstring>
 
+// This entire file is DEPRECATED, and will be removed at some point.
+// SkCanvas has full support for 4x4 matrices using SkM44
+
+// DEPRECATED
 struct SkVector4 {
     SkScalar fData[4];
 
@@ -53,11 +57,7 @@ struct SkVector4 {
     }
 };
 
-/** \class SkMatrix44
-
-    The SkMatrix44 class holds a 4x4 matrix.
-
-*/
+// DEPRECATED
 class SK_API SkMatrix44 {
 public: