Add log date to the metrics log

components/metrics/metrics_log_unittest.cc

 // Copyright 2014 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 "components/metrics/metrics_log.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
@@ skipping 116 matching lines @@
               system_profile.brand_code());
 
     const SystemProfileProto::Hardware& hardware =
         system_profile.hardware();
 
     EXPECT_TRUE(hardware.has_cpu());
     EXPECT_TRUE(hardware.cpu().has_vendor_name());
     EXPECT_TRUE(hardware.cpu().has_signature());
     EXPECT_TRUE(hardware.cpu().has_num_cores());
 
+    EXPECT_GE((base::Time::Now() - base::Time::UnixEpoch()).InSeconds(),
+              system_profile.log_date());
     // TODO(isherman): Verify other data written into the protobuf as a result
     // of this call.
   }
 
  protected:
   TestingPrefServiceSimple prefs_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MetricsLogTest);
 };
@@ skipping 316 matching lines @@
   TestMetricsServiceClient client;
   client.set_product(kTestProduct);
   TestMetricsLog log(
       kClientId, kSessionId, MetricsLog::ONGOING_LOG, &client, &prefs_);
   // Check that the product is set to |kTestProduct|.
   EXPECT_TRUE(log.uma_proto().has_product());
   EXPECT_EQ(kTestProduct, log.uma_proto().product());
 }
 
 }  // namespace metrics