SkCamera.h is deprecated

Change-Id: I57bd99f2bddb7ac182f7830245c9d342d2adda62
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/283430
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Reviewed-by: Heather Miller <hcm@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 857710f..cf6b62c 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -8,6 +8,9 @@
 
   * <insert new release note here>
 
+  * SkCamera.h and all of its contained classes 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
     the image filters themselves are defined in terms of discrete pixels, the radii provided by
     the user are mapped through the CTM so taking ints forced over discretization. After mapping