Move SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS to SkUserConfig temporarily

Going to remove this, but I need to rebaseline some layout tests, so
I have to temporarily move it from Skia's skia_for_chromium_defines
to this location.

Change-Id: I071e5d8536fb5ac8baa78e3eac3974ee4d9445d4
Reviewed-on: https://chromium-review.googlesource.com/c/1334091Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Cr-Commit-Position: refs/heads/master@{#607697}

skia/config/SkUserConfig.h

@@ -151,6 +151,10 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_DISABLE_EXPLICIT_GPU_RESOURCE_ALLOCATION
 #endif
 
+#ifndef SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS
+#define SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS
+#endif
+
 // Max. verb count for paths rendered by the edge-AA tessellating path renderer.
 #define GR_AA_TESSELLATOR_MAX_VERB_COUNT 100