Add --serial mode to dm, runs unit tests serially

tests/ColorSpaceTest.cpp

Index: tests/ColorSpaceTest.cpp
diff --git a/tests/ColorSpaceTest.cpp b/tests/ColorSpaceTest.cpp
index 66860da590d12dd4838ce0a714514b3cb18f8d50..3a33c1730c947ed68aa74e662a56f95f59fab3f2 100644
--- a/tests/ColorSpaceTest.cpp
+++ b/tests/ColorSpaceTest.cpp
@@ -259,3 +259,10 @@ DEF_TEST(ColorSpace_Equals, r) {
     REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), upperRight.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(upperRight.get(), adobe.get()));
 }
+
+DEF_TEST(ColorSpaceCRBug, r) {
+    sk_sp<SkData> data = SkData::MakeFromFileName(
+            GetResourcePath("invalid_images/crbug636268.png").c_str());
+    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(data.get()));
+    REPORTER_ASSERT(r, codec.get());
+}