rename virtuals for clipbounds, and deprecate older bool/var-arg pattern

BUG=skia:

Change-Id: I08bcc2d0559e02838772538816b928e0716dd3aa
Reviewed-on: https://skia-review.googlesource.com/7412
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/public.bzl b/public.bzl
index 14d0c53..72f33b3 100644
--- a/public.bzl
+++ b/public.bzl
@@ -590,6 +590,7 @@
     "SK_NO_ANALYTIC_AA",
     "SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF",
     "SK_SUPPORT_LEGACY_CLIPOP_EXOTIC_NAMES",
+    "SK_SUPPORT_LEGACY_GETCLIPBOUNDS",
 ]
 
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