LatencyInfo trace_id_ no longer dependent on sequence_number.

ui/latency/mojo/struct_traits_unittest.cc

 // Copyright 2016 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 <utility>
 
 #include "base/message_loop/message_loop.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/latency/mojo/latency_info_struct_traits.h"
@@ skipping 62 matching lines @@
   std::pair<LatencyComponentType, int64_t> input(type, id);
   mojom::TraitsTestServicePtr proxy = GetTraitsTestProxy();
   std::pair<LatencyComponentType, int64_t> output;
   proxy->EchoLatencyComponentId(input, &output);
   EXPECT_EQ(type, output.first);
   EXPECT_EQ(id, output.second);
 }
 
 TEST_F(StructTraitsTest, LatencyInfo) {
   LatencyInfo latency;
+  latency.set_trace_id(5);
   ASSERT_FALSE(latency.terminated());
   latency.AddLatencyNumber(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT, 1234, 0);
   latency.AddLatencyNumber(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 1234, 100);
   latency.AddLatencyNumber(INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT,
                            1234, 0);
 
-  EXPECT_EQ(100, latency.trace_id());
+  EXPECT_EQ(5, latency.trace_id());
   EXPECT_TRUE(latency.terminated());
 
   latency.set_source_event_type(ui::TOUCH);
 
   mojom::TraitsTestServicePtr proxy = GetTraitsTestProxy();
   LatencyInfo output;
   proxy->EchoLatencyInfo(latency, &output);
 
   EXPECT_EQ(latency.trace_id(), output.trace_id());
   EXPECT_EQ(latency.terminated(), output.terminated());
   EXPECT_EQ(latency.source_event_type(), output.source_event_type());
 
   EXPECT_TRUE(output.FindLatency(INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT, 1234,
                                  nullptr));
 
   LatencyInfo::LatencyComponent rwh_comp;
   EXPECT_TRUE(output.FindLatency(INPUT_EVENT_LATENCY_BEGIN_RWH_COMPONENT, 1234,
                                  &rwh_comp));
   EXPECT_EQ(100, rwh_comp.sequence_number);
   EXPECT_EQ(1u, rwh_comp.event_count);
 
   EXPECT_TRUE(output.FindLatency(
       INPUT_EVENT_LATENCY_TERMINATED_FRAME_SWAP_COMPONENT, 1234, nullptr));
 }
 
 }  // namespace ui