make the filter mode for GrTextureAccess an enum so we can plumb down

src/effects/gradients/SkGradientShader.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGradientShaderPriv.h"
 #include "SkLinearGradient.h"
 #include "SkRadialGradient.h"
@@ skipping 896 matching lines @@
     desc.fWidth  = bitmap.width();
     desc.fHeight = 32;
     desc.fRowHeight = bitmap.height();
     desc.fContext = ctx;
     desc.fConfig = SkBitmapConfig2GrPixelConfig(bitmap.config());
     fAtlas = GrTextureStripAtlas::GetAtlas(desc);
     GrAssert(NULL != fAtlas);
 
     // We always filter the gradient table. Each table is one row of a texture, so always y-clamp.
     GrTextureParams params;
-    params.setBilerp(true);
+    params.setFilterMode(GrTextureParams::kBilerp_FilterMode);
     params.setTileModeX(tileMode);
 
     fRow = fAtlas->lockRow(bitmap);
     if (-1 != fRow) {
         fYCoord = fAtlas->getYOffset(fRow) + SK_ScalarHalf *
                   fAtlas->getVerticalScaleFactor();
         fTextureAccess.reset(fAtlas->getTexture(), params);
     } else {
         GrTexture* texture = GrLockAndRefCachedBitmapTexture(ctx, bitmap, &params);
         fTextureAccess.reset(texture, params);
@@ skipping 49 matching lines @@
             (*stops)[i] = stop;
             stop = i < outColors - 1 ? stop + random->nextUScalar1() * (1.f - stop) : 1.f;
         }
     }
     *tm = static_cast<SkShader::TileMode>(random->nextULessThan(SkShader::kTileModeCount));
 
     return outColors;
 }
 
 #endif