Add option to enable sampler.

base/debug/trace_event_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/debug/trace_event_unittest.h"
 
 #include <cstdlib>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 1763 matching lines @@
 TEST_F(TraceEventTestFixture, TraceOptionsParsing) {
   ManualTestSetUp();
 
   EXPECT_EQ(TraceLog::RECORD_UNTIL_FULL,
             TraceLog::TraceOptionsFromString(std::string()));
 
   EXPECT_EQ(TraceLog::RECORD_UNTIL_FULL,
             TraceLog::TraceOptionsFromString("record-until-full"));
   EXPECT_EQ(TraceLog::RECORD_CONTINUOUSLY,
             TraceLog::TraceOptionsFromString("record-continuously"));
+  EXPECT_EQ(TraceLog::RECORD_UNTIL_FULL | TraceLog::ENABLE_SAMPLING,
+            TraceLog::TraceOptionsFromString("enable-sampling"));
+  EXPECT_EQ(TraceLog::RECORD_CONTINUOUSLY | TraceLog::ENABLE_SAMPLING,
+            TraceLog::TraceOptionsFromString(
+                "record-continuously,enable-sampling"));
 }
 
 // Not supported in split dll build. http://crbug.com/237249
 #if !defined(CHROME_SPLIT_DLL)
 TEST_F(TraceEventTestFixture, TraceSampling) {
   ManualTestSetUp();
 
   event_watch_notification_ = 0;
   TraceLog::GetInstance()->SetEnabled(
       CategoryFilter("*"),
@@ skipping 298 matching lines @@
   EXPECT_TRUE(CategoryFilter::IsEmptyOrContainsLeadingOrTrailingWhitespace(
       "   bad_category   "));
   EXPECT_TRUE(CategoryFilter::IsEmptyOrContainsLeadingOrTrailingWhitespace(
       ""));
   EXPECT_FALSE(CategoryFilter::IsEmptyOrContainsLeadingOrTrailingWhitespace(
       "good_category"));
 }
 
 }  // namespace debug
 }  // namespace base