Add a GrCustomCoordsTextureEffect class

src/gpu/gl/GrGLEffectMatrix.h

 /*
  * 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 GrGLEffectMatrix_DEFINED
 #define GrGLEffectMatrix_DEFINED
 
@@ skipping 42 matching lines @@
      * arbitrary shift in its final key. However, when GrGLEffectMatrix::emitCode*() code is called
      * the relevant bits must be in the lower kKeyBits of the key parameter.
      */
     enum {
         kKeyBits = kKeyBitsPrivate,
         kKeyMask = (1 << kKeyBits) - 1,
     };
 
     GrGLEffectMatrix(CoordsType coordsType)
         : fCoordsType(coordsType) {
-        SkASSERT(GrEffect::kLocal_CoordsType == coordsType ||
-                 GrEffect::kPosition_CoordsType == coordsType);
         fPrevMatrix = SkMatrix::InvalidMatrix();
     }
 
     /**
      * Generates the key for the portion of the code emitted by this class's emitCode() function.
      * Pass a texture to make GrGLEffectMatrix automatically adjust for the texture's origin. Pass
      * NULL when not using the EffectMatrix for a texture lookup, or if the GrGLEffect subclass
      * wants to handle origin adjustments in some other manner. The coords type param must match the
      * param that would be used to initialize GrGLEffectMatrix for the generating GrEffect.
      */
@@ skipping 36 matching lines @@
                  const GrDrawEffect& drawEffect,
                  const GrTexture*);
 
     GrGLUniformManager::UniformHandle fUni;
     GrSLType                          fUniType;
     SkMatrix                          fPrevMatrix;
     CoordsType                        fCoordsType;
 };
 
 #endif