Change QuicWallTime to have microsecond granularity.

net/tools/quic/quic_epoll_clock_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/quic_epoll_clock.h"
 
 #include "net/tools/quic/test_tools/mock_epoll_server.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace net {
 namespace tools {
 namespace test {
 
 TEST(QuicEpollClockTest, ApproximateNowInUsec) {
   MockEpollServer epoll_server;
   QuicEpollClock clock(&epoll_server);
 
   epoll_server.set_now_in_usec(1000000);
   EXPECT_EQ(1000000,
             clock.ApproximateNow().Subtract(QuicTime::Zero()).ToMicroseconds());
+  EXPECT_EQ(1u, clock.WallNow().ToUNIXSeconds());
+  EXPECT_EQ(1000000u, clock.WallNow().ToUNIXMicroseconds());
 
   epoll_server.AdvanceBy(5);
   EXPECT_EQ(1000005,
             clock.ApproximateNow().Subtract(QuicTime::Zero()).ToMicroseconds());
+  EXPECT_EQ(1u, clock.WallNow().ToUNIXSeconds());
+  EXPECT_EQ(1000005u, clock.WallNow().ToUNIXMicroseconds());
+
+  epoll_server.AdvanceBy(10 * 1000000);
+  EXPECT_EQ(11u, clock.WallNow().ToUNIXSeconds());
+  EXPECT_EQ(11000005u, clock.WallNow().ToUNIXMicroseconds());
 }
 
 TEST(QuicEpollClockTest, NowInUsec) {
   MockEpollServer epoll_server;
   QuicEpollClock clock(&epoll_server);
 
   epoll_server.set_now_in_usec(1000000);
   EXPECT_EQ(1000000,
             clock.Now().Subtract(QuicTime::Zero()).ToMicroseconds());
 
@@ skipping 13 matching lines @@
   // If end > start, then we can check now is between start and end.
   if (end > start) {
     EXPECT_LE(static_cast<uint64>(start.ToTimeT()), now.ToUNIXSeconds());
     EXPECT_LE(now.ToUNIXSeconds(), static_cast<uint64>(end.ToTimeT()));
   }
 }
 
 }  // namespace test
 }  // namespace tools
 }  // namespace net