add SkShader::newWithColorFilter

src/core/SkFilterShader.h

Index: src/core/SkFilterShader.h
diff --git a/src/core/SkFilterShader.h b/src/core/SkFilterShader.h
deleted file mode 100644
index ea5eaed34fe59428574bdd746df474f444e12e6c..0000000000000000000000000000000000000000
--- a/src/core/SkFilterShader.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkFilterShader_DEFINED
-#define SkFilterShader_DEFINED
-
-#include "SkShader.h"
-
-class SkColorFilter;
-
-class SkFilterShader : public SkShader {
-public:
-    SkFilterShader(SkShader* shader, SkColorFilter* filter);
-    virtual ~SkFilterShader();
-
-    size_t contextSize() const override;
-
-    class FilterShaderContext : public SkShader::Context {
-    public:
-        // Takes ownership of shaderContext and calls its destructor.
-        FilterShaderContext(const SkFilterShader&, SkShader::Context*, const ContextRec&);
-        virtual ~FilterShaderContext();
-
-        uint32_t getFlags() const override;
-
-        void shadeSpan(int x, int y, SkPMColor[], int count) override;
-
-        void set3DMask(const SkMask* mask) override {
-            // forward to our proxy
-            fShaderContext->set3DMask(mask);
-        }
-
-    private:
-        SkShader::Context* fShaderContext;
-
-        typedef SkShader::Context INHERITED;
-    };
-
-    SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkFilterShader)
-
-protected:
-    void flatten(SkWriteBuffer&) const override;
-    Context* onCreateContext(const ContextRec&, void* storage) const override;
-
-
-private:
-    SkShader*       fShader;
-    SkColorFilter*  fFilter;
-
-    typedef SkShader INHERITED;
-};
-
-#endif