SkLazyPtr suitable as a local or class member.

tests/LazyPtr.cpp

Index: tests/LazyPtr.cpp
diff --git a/tests/LazyPtr.cpp b/tests/LazyPtr.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ff235e6ed3b2dc0e3833a90d72e428c97d00c2c0
--- /dev/null
+++ b/tests/LazyPtr.cpp
@@ -0,0 +1,48 @@
+#include "Test.h"
+#include "SkLazyPtr.h"
+#include "SkTaskGroup.h"
+
+DEF_TEST(LazyPtr, r) {
+    SkLazyPtr<int> lazy;
+    int* ptr = lazy.get();
+
+    REPORTER_ASSERT(r, ptr);
+    REPORTER_ASSERT(r, lazy.get() == ptr);
+
+    SkLazyPtr<double> neverRead;
+}
+
+namespace {
+
+struct Racer : public SkRunnable {
+    Racer() : fLazy(NULL), fSeen(NULL) {}
+
+    virtual void run() SK_OVERRIDE { fSeen = fLazy->get(); }
+
+    SkLazyPtr<int>* fLazy;
+    int* fSeen;
+};
+
+} // namespace
+
+DEF_TEST(LazyPtr_Threaded, r) {
+    static const int kRacers = 321;
+
+    SkLazyPtr<int> lazy;
+
+    Racer racers[kRacers];
+    for (int i = 0; i < kRacers; i++) {
+        racers[i].fLazy = &lazy;
+    }
+
+    SkTaskGroup tg;
+    for (int i = 0; i < kRacers; i++) {
+        tg.add(racers + i);
+    }
+    tg.wait();
+
+    for (int i = 1; i < kRacers; i++) {
+        REPORTER_ASSERT(r, racers[i].fSeen);
+        REPORTER_ASSERT(r, racers[i].fSeen == racers[0].fSeen);
+    }
+}