namespace {} trick for SK_DECLARE_STATIC_ONCE

tests/OnceTest.cpp

Index: tests/OnceTest.cpp
diff --git a/tests/OnceTest.cpp b/tests/OnceTest.cpp
index 6ab9cd27ac2ae4a906e6b4ff96513abc17b51d20..1344cee5c44e4f3b7da15e80662011e23237f4bc 100644
--- a/tests/OnceTest.cpp
+++ b/tests/OnceTest.cpp
@@ -14,16 +14,16 @@ static void add_five(int* x) {
     *x += 5;
 }
 
+SK_DECLARE_STATIC_ONCE(st_once);
 DEF_TEST(SkOnce_Singlethreaded, r) {
     int x = 0;
 
-    SK_DECLARE_STATIC_ONCE(once);
     // No matter how many times we do this, x will be 5.
-    SkOnce(&once, add_five, &x);
-    SkOnce(&once, add_five, &x);
-    SkOnce(&once, add_five, &x);
-    SkOnce(&once, add_five, &x);
-    SkOnce(&once, add_five, &x);
+    SkOnce(&st_once, add_five, &x);
+    SkOnce(&st_once, add_five, &x);
+    SkOnce(&st_once, add_five, &x);
+    SkOnce(&st_once, add_five, &x);
+    SkOnce(&st_once, add_five, &x);
 
     REPORTER_ASSERT(r, 5 == x);
 }
@@ -46,15 +46,15 @@ public:
 
 }  // namespace
 
+SK_DECLARE_STATIC_ONCE(mt_once);
 DEF_TEST(SkOnce_Multithreaded, r) {
     const int kTasks = 16;
 
     // Make a bunch of tasks that will race to be the first to add six to x.
     Racer racers[kTasks];
-    SK_DECLARE_STATIC_ONCE(once);
     int x = 0;
     for (int i = 0; i < kTasks; i++) {
-        racers[i].once = &once;
+        racers[i].once = &mt_once;
         racers[i].ptr = &x;
     }
 
@@ -72,10 +72,10 @@ DEF_TEST(SkOnce_Multithreaded, r) {
 static int gX = 0;
 static void inc_gX() { gX++; }
 
+SK_DECLARE_STATIC_ONCE(noarg_once);
 DEF_TEST(SkOnce_NoArg, r) {
-    SK_DECLARE_STATIC_ONCE(once);
-    SkOnce(&once, inc_gX);
-    SkOnce(&once, inc_gX);
-    SkOnce(&once, inc_gX);
+    SkOnce(&noarg_once, inc_gX);
+    SkOnce(&noarg_once, inc_gX);
+    SkOnce(&noarg_once, inc_gX);
     REPORTER_ASSERT(r, 1 == gX);
 }