Make existing unit tests only run on GL contexts

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1869503002

Review URL: https://codereview.chromium.org/1869503002
diff --git a/tests/GpuDrawPathTest.cpp b/tests/GpuDrawPathTest.cpp
index ef3b97d..2dc7702 100644
--- a/tests/GpuDrawPathTest.cpp
+++ b/tests/GpuDrawPathTest.cpp
@@ -76,7 +76,7 @@
     fill_and_stroke(canvas, oval1, oval2, SkDashPathEffect::Make(intervals, 2, 0));
 }
 
-DEF_GPUTEST_FOR_ALL_CONTEXTS(GpuDrawPath, reporter, ctxInfo) {
+DEF_GPUTEST_FOR_ALL_GL_CONTEXTS(GpuDrawPath, reporter, ctxInfo) {
     for (auto& test_func : { &test_drawPathEmpty, &test_drawSameRectOvals }) {
         for (auto& sampleCount : {0, 4, 16}) {
             SkImageInfo info = SkImageInfo::MakeN32Premul(255, 255);