Bug 1173947 - Make getRandomValues message be urgent (r=mrbkap)

dom/base/test/chrome/cpows_child.js

@@ -90,6 +90,10 @@ function make_json()
 function parent_test(finish)
 {
   function f(check_func) {
+    // Make sure this doesn't crash.
+    let array = new Uint32Array(10);
+    content.crypto.getRandomValues(array);
+
     let result = check_func(10);
     ok(result == 20, "calling function in parent worked");
     return result;

dom/ipc/PContent.ipdl

@@ -732,7 +732,7 @@ parent:
 
     sync PCrashReporter(NativeThreadId tid, uint32_t processType);
 
-    sync GetRandomValues(uint32_t length)
+    prio(urgent) sync GetRandomValues(uint32_t length)
         returns (uint8_t[] randomValues);
 
     async GetSystemMemory(uint64_t getterId);