Create xfer processor backend.

src/gpu/gl/GrGpuGL.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpuGL_DEFINED
 #define GrGpuGL_DEFINED
 
@@ skipping 154 matching lines @@
     void setTextureUnit(int unitIdx);
 
     // Sets up vertex attribute pointers and strides. On return indexOffsetInBytes gives the offset
     // an into the index buffer. It does not account for drawInfo.startIndex() but rather the start
     // index is relative to the returned offset.
     void setupGeometry(const GrOptDrawState&,
                        const GrDrawTarget::DrawInfo& info,
                        size_t* indexOffsetInBytes);
 
     // Subclasses should call this to flush the blend state.
-    // The params should be the final coefficients to apply
-    // (after any blending optimizations or dual source blending considerations
-    // have been accounted for).
-    void flushBlend(const GrOptDrawState& optState, bool isLines,
-                    GrBlendCoeff srcCoeff, GrBlendCoeff dstCoeff);
+    void flushBlend(const GrOptDrawState& optState);
 
     bool hasExtension(const char* ext) const { return fGLContext.hasExtension(ext); }
 
     static bool BlendCoeffReferencesConstant(GrBlendCoeff coeff);
 
     class ProgramCache : public ::SkNoncopyable {
     public:
         ProgramCache(GrGpuGL* gpu);
         ~ProgramCache();
 
@@ skipping 258 matching lines @@
 
     // we record what stencil format worked last time to hopefully exit early
     // from our loop that tries stencil formats and calls check fb status.
     int fLastSuccessfulStencilFmtIdx;
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif