Paranoid temporary check that Chrome's building with SSE2 on all Windows builders.

src/ports/SkGlobalInitialization_chromium.cpp

Index: src/ports/SkGlobalInitialization_chromium.cpp
diff --git a/src/ports/SkGlobalInitialization_chromium.cpp b/src/ports/SkGlobalInitialization_chromium.cpp
index 3aecbd5471c71eb2a299b9c0f5486c5c64e2dfb4..9568748278d4dba20b48d93a40eed5bb961cf0c0 100644
--- a/src/ports/SkGlobalInitialization_chromium.cpp
+++ b/src/ports/SkGlobalInitialization_chromium.cpp
@@ -143,3 +143,7 @@ SK_DECLARE_STATIC_ONCE(once);
 void SkFlattenable::InitializeFlattenablesIfNeeded() {
     SkOnce(&once, SkPrivateEffectInitializer::Init);
 }
+
+#if defined(SK_BUILD_FOR_WIN32) && SK_CPU_SSE_LEVEL < SK_CPU_SSE_LEVEL_SSE2
+    #error "This double checks that Chromium is always built with SSE2+ on Windows."
+#endif