Add a mode flag to the tracing framework.

base/test/trace_event_analyzer_unittest.cc

Index: base/test/trace_event_analyzer_unittest.cc
diff --git a/base/test/trace_event_analyzer_unittest.cc b/base/test/trace_event_analyzer_unittest.cc
index eca2b70f638a8d4eec3b123207c78ff980b3e3f9..60043416456aa3eac205338c6749527dc2ccb430 100644
--- a/base/test/trace_event_analyzer_unittest.cc
+++ b/base/test/trace_event_analyzer_unittest.cc
@@ -39,11 +39,15 @@ void TraceEventAnalyzerTest::OnTraceDataCollected(
 void TraceEventAnalyzerTest::BeginTracing() {
   output_.json_output.clear();
   buffer_.Start();
-  base::debug::TraceLog::GetInstance()->SetEnabled(true);
+  base::debug::TraceLog::GetInstance()->SetEnabled(
+      true,
+      base::debug::TraceLog::RECORD_UNTIL_FULL);
 }
 
 void TraceEventAnalyzerTest::EndTracing() {
-  base::debug::TraceLog::GetInstance()->SetEnabled(false);
+  base::debug::TraceLog::GetInstance()->SetEnabled(
+      false,
+      base::debug::TraceLog::RECORD_UNTIL_FULL);
   base::debug::TraceLog::GetInstance()->Flush(
       base::Bind(&TraceEventAnalyzerTest::OnTraceDataCollected,
                  base::Unretained(this)));