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..9cfcc068528347c93fa29e2b8c2e9d1ff83bd0c4 100644
--- a/tests/ColorSpaceTest.cpp
+++ b/tests/ColorSpaceTest.cpp
@@ -259,3 +259,15 @@ DEF_TEST(ColorSpace_Equals, r) {
     REPORTER_ASSERT(r, !SkColorSpace::Equals(z30.get(), upperRight.get()));
     REPORTER_ASSERT(r, !SkColorSpace::Equals(upperRight.get(), adobe.get()));
 }
+
+// This test is only interesting on 32-bit builds.
+#if defined(SK_CPU_X86) || defined(SK_CPU_ARM32)

[mtklein, 2016/08/16 23:54:06]

Do we really need to not have the test exist?  Can't we just have it here and
not run it?

[msarett, 2016/08/17 12:40:45]

Sure, sgtm

+
+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());
+}
+
+#endif