remove external header for SkModeColorFilter

include/effects/SkModeColorFilter.h

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkModeColorFilter_DEFINED
-#define SkModeColorFilter_DEFINED
-
-#include "SkColorFilter.h"
-#include "SkColorPriv.h"
-#include "SkString.h"
-#include "SkXfermode.h"
-
-class SkModeColorFilter : public SkColorFilter {
-public:
-    static SkColorFilter* Create(SkColor color, SkXfermode::Mode mode) {
-        return new SkModeColorFilter(color, mode);
-    }
-
-    SkColor getColor() const { return fColor; }
-    SkXfermode::Mode getMode() const { return fMode; }
-    SkPMColor getPMColor() const { return fPMColor; }
-
-    bool asColorMode(SkColor*, SkXfermode::Mode*) const override;
-    uint32_t getFlags() const override;
-    void filterSpan(const SkPMColor shader[], int count, SkPMColor result[]) const override;
-
-#ifndef SK_IGNORE_TO_STRING
-    void toString(SkString* str) const override {
-        str->append("SkModeColorFilter: color: 0x");
-        str->appendHex(fColor);
-        str->append(" mode: ");
-        str->append(SkXfermode::ModeName(fMode));
-    }
-#endif
-
-#if SK_SUPPORT_GPU
-    const GrFragmentProcessor* asFragmentProcessor(GrContext*) const override;
-#endif
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkModeColorFilter)
-
-protected:
-    SkModeColorFilter(SkColor color, SkXfermode::Mode mode) {
-        fColor = color;
-        fMode = mode;
-        this->updateCache();
-    };
-
-    void flatten(SkWriteBuffer&) const override;
-
-private:
-    SkColor             fColor;
-    SkXfermode::Mode    fMode;
-    // cache
-    SkPMColor           fPMColor;
-    SkXfermodeProc      fProc;
-
-    void updateCache();
-
-    typedef SkColorFilter INHERITED;
-};
-
-#endif