remove avoid and pixelxor xfermodes

gm/pixelxorxfermode.cpp

Index: gm/pixelxorxfermode.cpp
diff --git a/gm/pixelxorxfermode.cpp b/gm/pixelxorxfermode.cpp
deleted file mode 100644
index 6a490e1767883267a42e886f8f9bf0a0496e5136..0000000000000000000000000000000000000000
--- a/gm/pixelxorxfermode.cpp
+++ /dev/null
@@ -1,82 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "gm.h"
-#include "Resources.h"
-
-#include "SkPixelXorXfermode.h"
-#include "SkStream.h"
-
-class PixelXorXfermodeGM : public skiagm::GM {
-public:
-    PixelXorXfermodeGM() { }
-
-protected:
-    SkString onShortName() override {
-        return SkString("pixelxorxfermode");
-    }
-
-    SkISize onISize() override { return SkISize::Make(512, 512); }
-
-    void onOnceBeforeDraw() override {
-        if (!GetResourceAsBitmap("mandrill_512.png", &fBM)) {
-            fBM.allocN32Pixels(1, 1);
-            fBM.eraseARGB(255, 255, 0 , 0); // red == bad
-        }
-    }
-
-    void onDraw(SkCanvas* canvas) override {
-        canvas->drawBitmap(fBM, 0, 0);
-
-        SkRect r = SkRect::MakeIWH(256, 256);
-
-        // Negate the red channel of the dst (via the ancillary color) but leave
-        // the green & blue channels alone
-        SkPaint p1;
-        p1.setColor(SK_ColorBLACK); // noop
-        p1.setXfermode(SkPixelXorXfermode::Make(0x7FFF0000));
-
-        canvas->drawRect(r, p1);
-
-        r.offsetTo(256.0f, 0.0f);
-
-        // Negate the dst color via the src color
-        SkPaint p2;
-        p2.setColor(SK_ColorWHITE);
-        p2.setXfermode(SkPixelXorXfermode::Make(SK_ColorBLACK)); // noop
-
-        canvas->drawRect(r, p2);
-
-        r.offsetTo(0.0f, 256.0f);
-
-        // Just return the original color
-        SkPaint p3;
-        p3.setColor(SK_ColorBLACK); // noop
-        p3.setXfermode(SkPixelXorXfermode::Make(SK_ColorBLACK)); // noop
-
-        canvas->drawRect(r, p3);
-
-        r.offsetTo(256.0f, 256.0f);
-
-        // Negate the red & green channels (via the ancillary color) but leave
-        // the blue channel alone
-        SkPaint p4;
-        p4.setColor(SK_ColorBLACK); // noop
-        p4.setXfermode(SkPixelXorXfermode::Make(SK_ColorYELLOW));
-
-        canvas->drawRect(r, p4);
-    }
-
-private:
-    SkBitmap fBM;
-
-    typedef GM INHERITED;
-};
-
-//////////////////////////////////////////////////////////////////////////////
-
-DEF_GM(return new PixelXorXfermodeGM;)