make SkXfermode.h go away

This is step one:
- make SkXfermode useless to public clients
- everything they should need is in SkBlendMode.h

Step two:
- remove SkXfermode.h entirely (since skia core will already be using SkXfermodePriv.h)

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4534

Change-Id: If2cea9f71df92430ed6644edb98dd306c5572cbc
Reviewed-on: https://skia-review.googlesource.com/4534
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/core/SkMaskFilter.h b/include/core/SkMaskFilter.h
index 34989354cd..2d0047757b 100644
--- a/include/core/SkMaskFilter.h
+++ b/include/core/SkMaskFilter.h
@@ -20,7 +20,9 @@ class GrClip;
 class GrContext;
 class GrRenderTargetContext;
 class GrPaint;
+class GrFragmentProcessor;
 class GrRenderTarget;
+class GrTexture;
 class GrTextureProvider;
 class SkBitmap;
 class SkBlitter;