Remove gpu shader optimatization for solid white or trans black colors

src/gpu/gl/GrGpuGL_program.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGpuGL.h"
 
 #include "GrEffect.h"
@@ skipping 335 matching lines @@
         *indexOffsetInBytes += ibuf->baseOffset();
     }
     GrGLAttribArrayState* attribState =
         fHWGeometryState.bindArrayAndBuffersToDraw(this, vbuf, ibuf);
 
     if (fCurrentProgram->hasVertexShader()) {
         int vertexAttribCount = this->getDrawState().getVertexAttribCount();
         uint32_t usedAttribArraysMask = 0;
         const GrVertexAttrib* vertexAttrib = this->getDrawState().getVertexAttribs();
 
+        bool canIgnoreColorAttrib = this->getDrawState().canIgnoreColorAttribute();
+
         for (int vertexAttribIndex = 0; vertexAttribIndex < vertexAttribCount;
              ++vertexAttribIndex, ++vertexAttrib) {
 
+            if (kColor_GrVertexAttribBinding != vertexAttrib->fBinding || !canIgnoreColorAttrib) {
             usedAttribArraysMask |= (1 << vertexAttribIndex);
             GrVertexAttribType attribType = vertexAttrib->fType;
             attribState->set(this,
                              vertexAttribIndex,
                              vbuf,
                              GrGLAttribTypeToLayout(attribType).fCount,
                              GrGLAttribTypeToLayout(attribType).fType,
                              GrGLAttribTypeToLayout(attribType).fNormalized,
                              stride,
                              reinterpret_cast<GrGLvoid*>(
                                  vertexOffsetInBytes + vertexAttrib->fOffset));
+            }
         }
         attribState->disableUnusedArrays(this, usedAttribArraysMask);
     }
 }