tracing: split trace event filter classes out of TraceLog

base/trace_event/trace_config_unittest.cc

 // Copyright 2015 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 <stddef.h>
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/macros.h"
 #include "base/trace_event/memory_dump_manager.h"
@@ skipping 414 matching lines @@
   EXPECT_EQ(1u, event_filter.included_categories().size());
   EXPECT_STREQ("*", event_filter.included_categories()[0].c_str());
   EXPECT_EQ(1u, event_filter.excluded_categories().size());
   EXPECT_STREQ("unfiltered_cat", event_filter.excluded_categories()[0].c_str());
   EXPECT_TRUE(event_filter.filter_args());
 
   std::string json_out;
   base::JSONWriter::Write(*event_filter.filter_args(), &json_out);
   EXPECT_STREQ(json_out.c_str(),
                "{\"event_name_whitelist\":[\"a snake\",\"a dog\"]}");
+  std::unordered_set<std::string> filter_values;
+  EXPECT_TRUE(event_filter.GetArgAsSet("event_name_whitelist", &filter_values));
+  EXPECT_EQ(2u, filter_values.size());
+  EXPECT_EQ(1u, filter_values.count("a snake"));
+  EXPECT_EQ(1u, filter_values.count("a dog"));
 
   const char config_string_2[] = "{\"included_categories\":[\"*\"]}";
   TraceConfig tc2(config_string_2);
   EXPECT_TRUE(tc2.IsCategoryEnabled("non-disabled-by-default-pattern"));
   EXPECT_FALSE(tc2.IsCategoryEnabled("disabled-by-default-pattern"));
   EXPECT_TRUE(tc2.IsCategoryGroupEnabled("non-disabled-by-default-pattern"));
   EXPECT_FALSE(tc2.IsCategoryGroupEnabled("disabled-by-default-pattern"));
 
   // Clear
   tc.Clear();
@@ skipping 216 matching lines @@
   EXPECT_NE(std::string::npos, tc.ToString().find("memory_dump_config"));
   EXPECT_EQ(2u, tc.memory_dump_config_.triggers.size());
   EXPECT_EQ(TraceConfig::MemoryDumpConfig::HeapProfiler
             ::kDefaultBreakdownThresholdBytes,
             tc.memory_dump_config_.heap_profiler_options
             .breakdown_threshold_bytes);
 }
 
 }  // namespace trace_event
 }  // namespace base