Add deferred texture upload API.

tests/Test.h

Index: tests/Test.h
diff --git a/tests/Test.h b/tests/Test.h
index d643c8382a168068412043f752ccb802c1c5d44c..3b965b61131f04d1d8f4d08940b9c2a1dc93fb50 100644
--- a/tests/Test.h
+++ b/tests/Test.h
@@ -94,11 +94,11 @@ void RunWithGPUTestContexts(T testFunction, GPUTestContexts contexts, Reporter*
         }                                         \
     } while (0)
 
-#define REPORTER_ASSERT_MESSAGE(r, cond, message)        \
-    do {                                                 \
-        if (!(cond)) {                                   \
-            REPORT_FAILURE(r, #cond, SkString(message)); \
-        }                                                \
+#define REPORTER_ASSERT_MESSAGE(r, cond, ...)                       \
+    do {                                                            \
+        if (!(cond)) {                                              \
+            REPORT_FAILURE(r, #cond, SkStringPrintf(__VA_ARGS__));  \
+        }                                                           \
     } while (0)
 
 #define ERRORF(r, ...)                                      \