Revise attribute binding interface

src/gpu/gl/GrGpuGL.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 "GrGLStencilBuffer.h"
@@ skipping 162 matching lines @@
                  this);
         GrPrintf("------ VENDOR %s\n", vendor);
         GrPrintf("------ RENDERER %s\n", renderer);
         GrPrintf("------ VERSION %s\n",  version);
         GrPrintf("------ EXTENSIONS\n %s \n", ext);
         ctx.info().caps()->print();
     }
 
     fProgramCache = SkNEW_ARGS(ProgramCache, (this->glContext()));
 
-    GrAssert(this->glCaps().maxVertexAttributes() >= GrDrawState::kVertexAttribCnt);
-    GrAssert(this->glCaps().maxVertexAttributes() > GrDrawState::kColorOverrideAttribIndexValue);
-    GrAssert(this->glCaps().maxVertexAttributes() > GrDrawState::kCoverageOverrideAttribIndexValue);
+    GrAssert(this->glCaps().maxVertexAttributes() >= GrDrawState::kMaxVertexAttribCnt);
 
     fLastSuccessfulStencilFmtIdx = 0;
     if (false) { // avoid bit rot, suppress warning
         fbo_test(this->glInterface(), 0, 0);
     }
 }
 
 GrGpuGL::~GrGpuGL() {
     if (0 != fHWProgramID) {
         // detach the current program so there is no confusion on OpenGL's part
@@ skipping 2059 matching lines @@
             this->setVertexArrayID(gpu, 0);
         }
         int attrCount = gpu->glCaps().maxVertexAttributes();
         if (fDefaultVertexArrayAttribState.count() != attrCount) {
             fDefaultVertexArrayAttribState.resize(attrCount);
         }
         attribState = &fDefaultVertexArrayAttribState;
     }
     return attribState;
 }