Fixed building with a bazel with hdrs_check fixed again.

Change-Id: I015f66cd6e02e07efa367b96edd775015ac0abca
diff --git a/aos/common/logging/context.cc b/aos/common/logging/context.cc
new file mode 100644
index 0000000..8874edb
--- /dev/null
+++ b/aos/common/logging/context.cc
@@ -0,0 +1,19 @@
+#include "aos/common/logging/context.h"
+
+#include <string.h>
+
+namespace aos {
+namespace logging {
+namespace internal {
+
+::std::atomic<LogImplementation *> global_top_implementation(NULL);
+
+Context::Context()
+    : implementation(global_top_implementation.load()),
+      sequence(0) {
+  cork_data.Reset();
+}
+
+}  // namespace internal
+}  // namespace logging
+}  // namespace aos