Revert of Add gpu implementation of SkAvoidXfermode

gm/avoidxfermode2.cpp

-/*
- * 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 "SkAvoidXfermode.h"
-
-class AvoidXfermode2GM : public skiagm::GM {
-public:
-    AvoidXfermode2GM() { }
-
-protected:
-    SkString onShortName() override {
-        return SkString("avoidxfermode2");
-    }
-
-    SkISize onISize() override { return SkISize::Make(128, 128); }
-
-    void onDraw(SkCanvas* canvas) override {
-        canvas->drawARGB(255, 0, 0, 0);
-
-        SkRect r = SkRect::MakeXYWH(32, 32, 64, 64);
-
-        SkPaint p0;
-        p0.setColor(SK_ColorGREEN);
-        p0.setAntiAlias(false);
-
-        canvas->drawRect(r, p0);
-
-        r = SkRect::MakeIWH(64, 64);
-
-        // UL corner: replace the green with a tight tolerance
-        SkPaint p1;
-        p1.setColor(SK_ColorRED);
-        p1.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               55,
-                                               SkAvoidXfermode::kTargetColor_Mode))->unref();
-
-        canvas->drawRect(r, p1);
-
-        r.offsetTo(64, 0.0f);
-
-        // UR corner: avoid the green with a tight tolerance
-        SkPaint p2;
-        p2.setColor(SK_ColorRED);
-        p2.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               200,
-                                               SkAvoidXfermode::kAvoidColor_Mode))->unref();
-
-        canvas->drawRect(r, p2);
-
-        r.offsetTo(0.0f, 64);
-
-        // LL corner: replace the green with a loose tolerance
-        SkPaint p3;
-        p3.setColor(SK_ColorRED);
-        p3.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               200,
-                                               SkAvoidXfermode::kTargetColor_Mode))->unref();
-
-        canvas->drawRect(r, p3);
-
-        r.offsetTo(64, 64);
-
-        // LR corner: avoid the green with a loose tolerance
-        SkPaint p4;
-        p4.setColor(SK_ColorRED);
-        p4.setXfermode(SkAvoidXfermode::Create(SK_ColorGREEN,
-                                               55,
-                                               SkAvoidXfermode::kAvoidColor_Mode))->unref();
-
-        canvas->drawRect(r, p4);
-    }
-
-private:
-    typedef GM INHERITED;
-};
-
-//////////////////////////////////////////////////////////////////////////////
-
-DEF_GM(return new AvoidXfermode2GM;)