Give Color32 weak attribute.
Give Color32 weak attribute.

Added hooks to Color32.

Change-Id: Iadac7d485c2dadfa49bbf5b0a4068473322a13d8
Signed-off-by: Chet Kener <4bada73e411a9c678a318a79d04d7df4a5fc4429@gmail.com>

MinimalOS-AOSP/platform_external_skia,UBERMALLOW/external_skia,UBERMALLOW/external_skia,MinimalOS-AOSP/platform_external_skia,MinimalOS-AOSP/platform_external_skia,MinimalOS-AOSP/platform_external_skia,UBERMALLOW/external_skia,MinimalOS-AOSP/platform_external_skia,UBERMALLOW/external_skia,MinimalOS-AOSP/platform_external_skia,UBERMALLOW/external_skia,UBERMALLOW/external_skia,UBERMALLOW/external_skia,MinimalOS-AOSP/platform_external_skia,MinimalOS-AOSP/platform_external_skia,MinimalOS-AOSP/platform_external_skia,UBERMALLOW/external_skia,UBERMALLOW/external_skia