Add mock gl fuzzer

Bug: skia:
Change-Id: I661eed3cdddba67aadfff5b3fe7b96ac29180c61
Reviewed-on: https://skia-review.googlesource.com/117637
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
diff --git a/fuzz/FuzzCanvas.cpp b/fuzz/FuzzCanvas.cpp
index c7f1419..879f9a4 100644
--- a/fuzz/FuzzCanvas.cpp
+++ b/fuzz/FuzzCanvas.cpp
@@ -1818,10 +1818,17 @@
     fuzz_ganesh(fuzz, f.get(sk_gpu_test::GrContextFactory::kNullGL_ContextType));
 }
 
+// This target is deprecated, DebugGLContext is not well maintained.
+// Please use MockGLCanvas instead.
 DEF_FUZZ(DebugGLCanvas, fuzz) {
     sk_gpu_test::GrContextFactory f;
     fuzz_ganesh(fuzz, f.get(sk_gpu_test::GrContextFactory::kDebugGL_ContextType));
 }
+
+DEF_FUZZ(MockGLCanvas, fuzz) {
+    sk_gpu_test::GrContextFactory f;
+    fuzz_ganesh(fuzz, f.get(sk_gpu_test::GrContextFactory::kMock_ContextType));
+}
 #endif
 
 DEF_FUZZ(PDFCanvas, fuzz) {