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

src/gpu/gl/GrGpuGL.cpp

Index: src/gpu/gl/GrGpuGL.cpp
diff --git a/src/gpu/gl/GrGpuGL.cpp b/src/gpu/gl/GrGpuGL.cpp
index cf6cf413e7b82a3e98aac6eebd1804456e9b0e7e..4102c8c48ba72bf1e643d22b5c893f4cae39674e 100644
--- a/src/gpu/gl/GrGpuGL.cpp
+++ b/src/gpu/gl/GrGpuGL.cpp
@@ -2006,7 +2006,7 @@ void GrGpuGL::bindTexture(int unitIdx, const GrTextureParams& params, GrGLTextur
     bool setAll = timestamp < this->getResetTimestamp();
     GrGLTexture::TexParams newTexParams;
 
-    newTexParams.fFilter = params.isBilerp() ? GR_GL_LINEAR : GR_GL_NEAREST;
+    newTexParams.fFilter = (params.filterMode() == GrTextureParams::kNone_FilterMode) ? GR_GL_LINEAR : GR_GL_NEAREST;
 
     newTexParams.fWrapS = tile_to_gl_wrap(params.getTileModeX());
     newTexParams.fWrapT = tile_to_gl_wrap(params.getTileModeY());