Increase tick precision in TaskQueue on Windows 64.
Hopefully this will reduce the flakiness of PostDelayedTask.

BUG=none

Review-Url: https://codereview.webrtc.org/2728663008
Cr-Commit-Position: refs/heads/master@{#17001}
diff --git a/webrtc/base/task_queue_unittest.cc b/webrtc/base/task_queue_unittest.cc
index c5faf8f..432a0d5 100644
--- a/webrtc/base/task_queue_unittest.cc
+++ b/webrtc/base/task_queue_unittest.cc
@@ -102,7 +102,7 @@
 TEST(TaskQueueTest, PostDelayed) {
   static const char kQueueName[] = "PostDelayed";
   Event event(false, false);
-  TaskQueue queue(kQueueName);
+  TaskQueue queue(kQueueName, TaskQueue::Priority::HIGH);
 
   uint32_t start = Time();
   queue.PostDelayedTask(Bind(&CheckCurrent, kQueueName, &event, &queue), 100);