Revert of Create xfer processor backend.

src/gpu/gl/GrGLXferProcessor.h

Index: src/gpu/gl/GrGLXferProcessor.h
diff --git a/src/gpu/gl/GrGLXferProcessor.h b/src/gpu/gl/GrGLXferProcessor.h
deleted file mode 100644
index 5c9255903152a6f0bd72019aa976709791fcb57e..0000000000000000000000000000000000000000
--- a/src/gpu/gl/GrGLXferProcessor.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright 2014 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrGLXferProcessor_DEFINED
-#define GrGLXferProcessor_DEFINED
-
-#include "GrGLProcessor.h"
-
-class GrGLXPBuilder;
-
-class GrGLXferProcessor {
-public:
-    GrGLXferProcessor() {}
-    virtual ~GrGLXferProcessor() {}
-
-    typedef GrGLProcessor::TextureSamplerArray TextureSamplerArray;
-    struct EmitArgs {
-        EmitArgs(GrGLXPBuilder* pb,
-                 const GrXferProcessor& xp,
-                 const char* inputColor,
-                 const char* inputCoverage,
-                 const char* outputPrimary,
-                 const char* outputSecondary,
-                 const TextureSamplerArray& samplers)
-            : fPB(pb)
-            , fXP(xp)
-            , fInputColor(inputColor)
-            , fInputCoverage(inputCoverage)
-            , fOutputPrimary(outputPrimary)
-            , fOutputSecondary(outputSecondary)
-            , fSamplers(samplers) {}
-
-        GrGLXPBuilder* fPB;
-        const GrXferProcessor& fXP;
-        const char* fInputColor;
-        const char* fInputCoverage;
-        const char* fOutputPrimary;
-        const char* fOutputSecondary;
-        const TextureSamplerArray& fSamplers;
-    };
-    /**
-     * This is similar to emitCode() in the base class, except it takes a full shader builder.
-     * This allows the effect subclass to emit vertex code.
-     */
-    virtual void emitCode(const EmitArgs&) = 0;
-
-    /** A GrGLXferProcessor instance can be reused with any GrGLXferProcessor that produces
-        the same stage key; this function reads data from a GrGLXferProcessor and uploads any
-        uniform variables required  by the shaders created in emitCode(). The GrXferProcessor
-        parameter is guaranteed to be of the same type that created this GrGLXferProcessor and
-        to have an identical processor key as the one that created this GrGLXferProcessor.  */
-    virtual void setData(const GrGLProgramDataManager&,
-                         const GrXferProcessor&) = 0;
-private:
-    typedef GrGLProcessor INHERITED;
-};
-#endif