Allow tracing in third_party libraries

base/test/trace_event_analyzer.h

 // Copyright (c) 2011 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.
 
 // Use trace_analyzer::Query and trace_analyzer::TraceAnalyzer to search for
 // specific trace events that were generated by the trace_event.h API.
 //
 // Basic procedure:
 // - Get trace events JSON string from base::debug::TraceLog.
 // - Create TraceAnalyzer with JSON string.
@@ skipping 134 matching lines @@
   int GetKnownArgAsInt(const std::string& name) const;
   bool GetKnownArgAsBool(const std::string& name) const;
 
   // Process ID and Thread ID.
   ProcessThreadID thread;
 
   // Time since epoch in microseconds.
   // Stored as double to match its JSON representation.
   double timestamp;
 
-  base::debug::TraceEventPhase phase;
+  char phase;
 
   std::string category;
 
   std::string name;
 
   std::string id;
 
   // All numbers and bool values from TraceEvent args are cast to double.
   // bool becomes 1.0 (true) or 0.0 (false).
   std::map<std::string, double> arg_numbers;
@@ skipping 75 matching lines @@
 
   // Compare with the given number.
   static Query Double(double num);
   static Query Int(int32 num);
   static Query Uint(uint32 num);
 
   // Compare with the given bool.
   static Query Bool(bool boolean);
 
   // Compare with the given phase.
-  static Query Phase(base::debug::TraceEventPhase phase);
+  static Query Phase(char phase);
 
   // Compare with the given string pattern. Only works with == and != operators.
   // Example: Query(EVENT_NAME) == Query::Pattern("MyEvent*")
   static Query Pattern(const std::string& pattern);
 
   // Common queries:
 
   // Find BEGIN events that have a corresponding END event.
   static Query MatchBeginWithEnd() {
     return (Query(EVENT_PHASE) == Query::Phase(TRACE_EVENT_PHASE_BEGIN)) &&
@@ skipping 105 matching lines @@
   bool GetAsDouble(const TraceEvent& event, double* num) const;
 
   // Attempt to convert this Query to a string. On success, true is returned
   // and the string value is stored in |str|.
   bool GetAsString(const TraceEvent& event, std::string* str) const;
 
   // Evaluate this Query as an arithmetic operator on left_ and right_.
   bool EvaluateArithmeticOperator(const TraceEvent& event,
                                   double* num) const;
 
-  // For QUERY_EVENT_MEMBER Query: attempt to get the value of the Query.
-  // The TraceValue will either be TRACE_TYPE_DOUBLE, TRACE_TYPE_STRING,
-  // or if requested member does not exist, it will be TRACE_TYPE_UNDEFINED.
-  base::debug::TraceValue GetMemberValue(const TraceEvent& event) const;
+  // For QUERY_EVENT_MEMBER Query: attempt to get the double value of the Query.
+  bool GetMemberValueAsDouble(const TraceEvent& event, double* num) const;
+
+  // For QUERY_EVENT_MEMBER Query: attempt to get the string value of the Query.
+  bool GetMemberValueAsString(const TraceEvent& event, std::string* num) const;
 
   // Does this Query represent a value?
   bool is_value() const { return type_ != QUERY_BOOLEAN_OPERATOR; }
 
   bool is_unary_operator() const {
     return operator_ == OP_NOT || operator_ == OP_NEGATE;
   }
 
   bool is_comparison_operator() const {
     return operator_ != OP_INVALID && operator_ < OP_AND;
@@ skipping 149 matching lines @@
 
 // Count all matches.
 static inline size_t CountMatches(const TraceEventVector& events,
                                   const Query& query) {
   return CountMatches(events, query, 0u, events.size());
 }
 
 }  // namespace trace_analyzer
 
 #endif  // BASE_TEST_TRACE_EVENT_ANALYZER_H_