Add cast and assignment operators to SkAtomic.

This is not really an API change.

TBR=reed@google.com

BUG=skia:

Review URL: https://codereview.chromium.org/1369333002

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/AtomicTest.cpp b/tests/AtomicTest.cpp
index 7eb7a7103b..e9db3f093d 100644
--- a/tests/AtomicTest.cpp
+++ b/tests/AtomicTest.cpp
@@ -54,4 +54,13 @@ DEF_TEST(Atomic, reporter) {
     int32_t valueToModify = 3;
     const int32_t originalValue = valueToModify;
     REPORTER_ASSERT(reporter, originalValue == sk_atomic_add(&valueToModify, 7));
+
+    {
+        SkAtomic<int> v {0};
+        REPORTER_ASSERT(reporter, 0 == v.load());
+        v = 10;
+        REPORTER_ASSERT(reporter, 10 == v.load());
+        int q = v;
+        REPORTER_ASSERT(reporter, 10 == q);
+    }
 }