[cros] RlzValueStore implementation for ChromeOS.

rlz/lib/rlz_lib.h

Index: rlz/lib/rlz_lib.h
diff --git a/rlz/lib/rlz_lib.h b/rlz/lib/rlz_lib.h
index 1f8be5ca2d54966ea258d4742abfdc1a05a2464d..a8407419a9b26a6deb4236cc3fa586f12cdaa4a4 100644
--- a/rlz/lib/rlz_lib.h
+++ b/rlz/lib/rlz_lib.h
@@ -44,6 +44,12 @@
 #endif
 #endif
 
+#if defined(OS_CHROMEOS)
+namespace base {
+class SequencedTaskRunner;
+}  // namespace base
+#endif
+
 #if defined(RLZ_NETWORK_IMPLEMENTATION_CHROME_NET)
 namespace net {
 class URLRequestContextGetter;
@@ -71,6 +77,12 @@ const size_t kMaxPingResponseLength = 0x4000;  // 16K
 bool RLZ_LIB_API SetURLRequestContext(net::URLRequestContextGetter* context);
 #endif
 
+#if defined(OS_CHROMEOS)
+// Set the MessageLoopProxy used by RLZ store to run I/O tasks on. Should be
+// called before any other API calls.
+void RLZ_LIB_API SetIOTaskRunner(base::SequencedTaskRunner* io_task_runner);
+#endif
+
 // RLZ storage functions.
 
 // Get all the events reported by this product as a CGI string to append to