rename GrTextureDesc->GrSurfaceDesc, GrTextureFlags->GrSurfaceFlags

Review URL: https://codereview.chromium.org/682223002
diff --git a/src/effects/SkAlphaThresholdFilter.cpp b/src/effects/SkAlphaThresholdFilter.cpp
index 7e91af4..326f005 100644
--- a/src/effects/SkAlphaThresholdFilter.cpp
+++ b/src/effects/SkAlphaThresholdFilter.cpp
@@ -272,13 +272,13 @@
                                                      const SkIRect&) const {
     if (fp) {
         GrContext* context = texture->getContext();
-        GrTextureDesc maskDesc;
+        GrSurfaceDesc maskDesc;
         if (context->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
             maskDesc.fConfig = kAlpha_8_GrPixelConfig;
         } else {
             maskDesc.fConfig = kRGBA_8888_GrPixelConfig;
         }
-        maskDesc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
+        maskDesc.fFlags = kRenderTarget_GrSurfaceFlag | kNoStencil_GrSurfaceFlag;
         // Add one pixel of border to ensure that clamp mode will be all zeros
         // the outside.
         maskDesc.fWidth = texture->width();