Disable unused attributes when using copy shader

src/gpu/gl/GrGLGpu.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 "GrGLGpu.h"
 #include "GrGLStencilAttachment.h"
@@ skipping 2803 matching lines @@
 
     GL_CALL(UseProgram(fCopyProgram.fProgram));
     fHWProgramID = fCopyProgram.fProgram;
 
     fHWGeometryState.setVertexArrayID(this, 0);
 
     GrGLAttribArrayState* attribs =
         fHWGeometryState.bindArrayAndBufferToDraw(this, fCopyProgram.fArrayBuffer);
     attribs->set(this, 0, fCopyProgram.fArrayBuffer, 2, GR_GL_FLOAT, false,
                     2 * sizeof(GrGLfloat), 0);
-
+    attribs->disableUnusedArrays(this, 0x1);
 
     // dst rect edges in NDC (-1 to 1)
     int dw = dst->width();
     int dh = dst->height();
     GrGLfloat dx0 = 2.f * dstPoint.fX / dw - 1.f;
     GrGLfloat dx1 = 2.f * (dstPoint.fX + w) / dw - 1.f;
     GrGLfloat dy0 = 2.f * dstPoint.fY / dh - 1.f;
     GrGLfloat dy1 = 2.f * (dstPoint.fY + h) / dh - 1.f;
     if (kBottomLeft_GrSurfaceOrigin == dst->origin()) {
         dy0 = -dy0;
@@ skipping 232 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }