Store context options on caps.

Review URL: https://codereview.chromium.org/1158433006
diff --git a/src/gpu/GrSWMaskHelper.cpp b/src/gpu/GrSWMaskHelper.cpp
index aa922ca..2591186 100644
--- a/src/gpu/GrSWMaskHelper.cpp
+++ b/src/gpu/GrSWMaskHelper.cpp
@@ -174,7 +174,7 @@
                                      resultBounds.height());
 
     if (allowCompression &&
-        fContext->getOptions().fDrawPathToCompressedTexture &&
+        fContext->getGpu()->caps()->drawPathMasksToCompressedTexturesSupport() &&
         choose_compressed_fmt(fContext->getGpu()->caps(), &fCompressedFormat)) {
         fCompressionMode = kCompress_CompressionMode;
     }