Add base effect for gpu 2pt conical gradients

src/effects/gradients/SkTwoPointConicalGradient.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTwoPointConicalGradient.h"
 
 #include "SkTwoPointConicalGradient_gpu.h"
@@ skipping 317 matching lines @@
     buffer.writePoint(fCenter2);
     buffer.writeScalar(fRadius1);
     buffer.writeScalar(fRadius2);
 }
 
 #if SK_SUPPORT_GPU
 
 GrEffectRef* SkTwoPointConicalGradient::asNewEffect(GrContext* context, const SkPaint&) const {
     SkASSERT(NULL != context);
     SkASSERT(fPtsToUnit.isIdentity());
-    // invert the localM, translate to center1, rotate so center2 is on x axis.
-    SkMatrix matrix;
-    if (!this->getLocalMatrix().invert(&matrix)) {
-        return NULL;
-    }
-    matrix.postTranslate(-fCenter1.fX, -fCenter1.fY);
 
-    SkPoint diff = fCenter2 - fCenter1;
-    SkScalar diffLen = diff.length();
-    if (0 != diffLen) {
-        SkScalar invDiffLen = SkScalarInvert(diffLen);
-        SkMatrix rot;
-        rot.setSinCos(-SkScalarMul(invDiffLen, diff.fY),
-                       SkScalarMul(invDiffLen, diff.fX));
-        matrix.postConcat(rot);
-    }
-
-    return Gr2PtConicalGradientEffect::Create(context, *this, matrix, fTileMode);
+    return Gr2PtConicalGradientEffect::Create(context, *this, fTileMode);
 }
 
 #else
 
 GrEffectRef* SkTwoPointConicalGradient::asNewEffect(GrContext*, const SkPaint&) const {
     SkDEBUGFAIL("Should not call in GPU-less build");
     return NULL;
 }
 
 #endif
@@ skipping 16 matching lines @@
     str->appendScalar(fCenter2.fY);
     str->append(") radius2: ");
     str->appendScalar(fRadius2);
     str->append(" ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif