Implement sampling profiler (chromium side change)

base/test/trace_event_analyzer_unittest.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 "base/bind.h"
 #include "base/debug/trace_event_unittest.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/trace_event_analyzer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 29 matching lines @@
   buffer_.AddFragment(json_events_str->data());
   if (!has_more_events)
     flush_complete_event->Signal();
 }
 
 void TraceEventAnalyzerTest::BeginTracing() {
   output_.json_output.clear();
   buffer_.Start();
   base::debug::TraceLog::GetInstance()->SetEnabled(
       base::debug::CategoryFilter("*"),
+      base::debug::TraceLog::RECORDING_MODE,
       base::debug::TraceLog::RECORD_UNTIL_FULL);
 }
 
 void TraceEventAnalyzerTest::EndTracing() {
   base::debug::TraceLog::GetInstance()->SetDisabled();
   base::WaitableEvent flush_complete_event(false, false);
   base::debug::TraceLog::GetInstance()->Flush(
       base::Bind(&TraceEventAnalyzerTest::OnTraceDataCollected,
                  base::Unretained(this),
                  base::Unretained(&flush_complete_event)));
@@ skipping 821 matching lines @@
   EXPECT_EQ(num_events, CountMatches(event_ptrs, Query::Bool(true)));
   EXPECT_EQ(num_events - 1, CountMatches(event_ptrs, Query::Bool(true),
                                          1, num_events));
   EXPECT_EQ(1u, CountMatches(event_ptrs, query_one));
   EXPECT_EQ(num_events - 1, CountMatches(event_ptrs, !query_one));
   EXPECT_EQ(num_named, CountMatches(event_ptrs, query_named));
 }
 
 
 }  // namespace trace_analyzer