Roll Chrome into Mojo.

base/debug/trace_event_impl.h

Index: base/debug/trace_event_impl.h
diff --git a/base/debug/trace_event_impl.h b/base/debug/trace_event_impl.h
index 1b1fce34cc209b452da54cad9b68f10696f4b79e..a619d2903546c529f399abc920e3985696d6a8d9 100644
--- a/base/debug/trace_event_impl.h
+++ b/base/debug/trace_event_impl.h
@@ -1,813 +1,14 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2014 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.
 
+// In the process of moving the trace event files. Right now the headers
+// are being forwarded. In next CLs the change will get completed
+// TODO(ssid): https://code.google.com/p/chromium/issues/detail?id=451032
 
 #ifndef BASE_DEBUG_TRACE_EVENT_IMPL_H_
 #define BASE_DEBUG_TRACE_EVENT_IMPL_H_
 
-#include <stack>
-#include <string>
-#include <vector>
-
-#include "base/atomicops.h"
-#include "base/base_export.h"
-#include "base/callback.h"
-#include "base/containers/hash_tables.h"
-#include "base/gtest_prod_util.h"
-#include "base/memory/ref_counted_memory.h"
-#include "base/memory/scoped_vector.h"
-#include "base/observer_list.h"
-#include "base/strings/string_util.h"
-#include "base/synchronization/condition_variable.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread.h"
-#include "base/threading/thread_local.h"
-
-// Older style trace macros with explicit id and extra data
-// Only these macros result in publishing data to ETW as currently implemented.
-#define TRACE_EVENT_BEGIN_ETW(name, id, extra) \
-    base::debug::TraceLog::AddTraceEventEtw( \
-        TRACE_EVENT_PHASE_BEGIN, \
-        name, reinterpret_cast<const void*>(id), extra)
-
-#define TRACE_EVENT_END_ETW(name, id, extra) \
-    base::debug::TraceLog::AddTraceEventEtw( \
-        TRACE_EVENT_PHASE_END, \
-        name, reinterpret_cast<const void*>(id), extra)
-
-#define TRACE_EVENT_INSTANT_ETW(name, id, extra) \
-    base::debug::TraceLog::AddTraceEventEtw( \
-        TRACE_EVENT_PHASE_INSTANT, \
-        name, reinterpret_cast<const void*>(id), extra)
-
-template <typename Type>
-struct DefaultSingletonTraits;
-
-namespace base {
-
-class WaitableEvent;
-class MessageLoop;
-
-namespace debug {
-
-// For any argument of type TRACE_VALUE_TYPE_CONVERTABLE the provided
-// class must implement this interface.
-class BASE_EXPORT ConvertableToTraceFormat
-    : public RefCounted<ConvertableToTraceFormat> {
- public:
-  // Append the class info to the provided |out| string. The appended
-  // data must be a valid JSON object. Strings must be properly quoted, and
-  // escaped. There is no processing applied to the content after it is
-  // appended.
-  virtual void AppendAsTraceFormat(std::string* out) const = 0;
-
-  std::string ToString() const {
-    std::string result;
-    AppendAsTraceFormat(&result);
-    return result;
-  }
-
- protected:
-  virtual ~ConvertableToTraceFormat() {}
-
- private:
-  friend class RefCounted<ConvertableToTraceFormat>;
-};
-
-struct TraceEventHandle {
-  uint32 chunk_seq;
-  uint16 chunk_index;
-  uint16 event_index;
-};
-
-const int kTraceMaxNumArgs = 2;
-
-class BASE_EXPORT TraceEvent {
- public:
-  union TraceValue {
-    bool as_bool;
-    unsigned long long as_uint;
-    long long as_int;
-    double as_double;
-    const void* as_pointer;
-    const char* as_string;
-  };
-
-  TraceEvent();
-  ~TraceEvent();
-
-  // We don't need to copy TraceEvent except when TraceEventBuffer is cloned.
-  // Use explicit copy method to avoid accidentally misuse of copy.
-  void CopyFrom(const TraceEvent& other);
-
-  void Initialize(
-      int thread_id,
-      TimeTicks timestamp,
-      TimeTicks thread_timestamp,
-      char phase,
-      const unsigned char* category_group_enabled,
-      const char* name,
-      unsigned long long id,
-      int num_args,
-      const char** arg_names,
-      const unsigned char* arg_types,
-      const unsigned long long* arg_values,
-      const scoped_refptr<ConvertableToTraceFormat>* convertable_values,
-      unsigned char flags);
-
-  void Reset();
-
-  void UpdateDuration(const TimeTicks& now, const TimeTicks& thread_now);
-
-  // Serialize event data to JSON
-  void AppendAsJSON(std::string* out) const;
-  void AppendPrettyPrinted(std::ostringstream* out) const;
-
-  static void AppendValueAsJSON(unsigned char type,
-                                TraceValue value,
-                                std::string* out);
-
-  TimeTicks timestamp() const { return timestamp_; }
-  TimeTicks thread_timestamp() const { return thread_timestamp_; }
-  char phase() const { return phase_; }
-  int thread_id() const { return thread_id_; }
-  TimeDelta duration() const { return duration_; }
-  TimeDelta thread_duration() const { return thread_duration_; }
-  unsigned long long id() const { return id_; }
-  unsigned char flags() const { return flags_; }
-
-  // Exposed for unittesting:
-
-  const base::RefCountedString* parameter_copy_storage() const {
-    return parameter_copy_storage_.get();
-  }
-
-  const unsigned char* category_group_enabled() const {
-    return category_group_enabled_;
-  }
-
-  const char* name() const { return name_; }
-
-#if defined(OS_ANDROID)
-  void SendToATrace();
-#endif
-
- private:
-  // Note: these are ordered by size (largest first) for optimal packing.
-  TimeTicks timestamp_;
-  TimeTicks thread_timestamp_;
-  TimeDelta duration_;
-  TimeDelta thread_duration_;
-  // id_ can be used to store phase-specific data.
-  unsigned long long id_;
-  TraceValue arg_values_[kTraceMaxNumArgs];
-  const char* arg_names_[kTraceMaxNumArgs];
-  scoped_refptr<ConvertableToTraceFormat> convertable_values_[kTraceMaxNumArgs];
-  const unsigned char* category_group_enabled_;
-  const char* name_;
-  scoped_refptr<base::RefCountedString> parameter_copy_storage_;
-  int thread_id_;
-  char phase_;
-  unsigned char flags_;
-  unsigned char arg_types_[kTraceMaxNumArgs];
-
-  DISALLOW_COPY_AND_ASSIGN(TraceEvent);
-};
-
-// TraceBufferChunk is the basic unit of TraceBuffer.
-class BASE_EXPORT TraceBufferChunk {
- public:
-  explicit TraceBufferChunk(uint32 seq)
-      : next_free_(0),
-        seq_(seq) {
-  }
-
-  void Reset(uint32 new_seq);
-  TraceEvent* AddTraceEvent(size_t* event_index);
-  bool IsFull() const { return next_free_ == kTraceBufferChunkSize; }
-
-  uint32 seq() const { return seq_; }
-  size_t capacity() const { return kTraceBufferChunkSize; }
-  size_t size() const { return next_free_; }
-
-  TraceEvent* GetEventAt(size_t index) {
-    DCHECK(index < size());
-    return &chunk_[index];
-  }
-  const TraceEvent* GetEventAt(size_t index) const {
-    DCHECK(index < size());
-    return &chunk_[index];
-  }
-
-  scoped_ptr<TraceBufferChunk> Clone() const;
-
-  static const size_t kTraceBufferChunkSize = 64;
-
- private:
-  size_t next_free_;
-  TraceEvent chunk_[kTraceBufferChunkSize];
-  uint32 seq_;
-};
-
-// TraceBuffer holds the events as they are collected.
-class BASE_EXPORT TraceBuffer {
- public:
-  virtual ~TraceBuffer() {}
-
-  virtual scoped_ptr<TraceBufferChunk> GetChunk(size_t *index) = 0;
-  virtual void ReturnChunk(size_t index,
-                           scoped_ptr<TraceBufferChunk> chunk) = 0;
-
-  virtual bool IsFull() const = 0;
-  virtual size_t Size() const = 0;
-  virtual size_t Capacity() const = 0;
-  virtual TraceEvent* GetEventByHandle(TraceEventHandle handle) = 0;
-
-  // For iteration. Each TraceBuffer can only be iterated once.
-  virtual const TraceBufferChunk* NextChunk() = 0;
-
-  virtual scoped_ptr<TraceBuffer> CloneForIteration() const = 0;
-};
-
-// TraceResultBuffer collects and converts trace fragments returned by TraceLog
-// to JSON output.
-class BASE_EXPORT TraceResultBuffer {
- public:
-  typedef base::Callback<void(const std::string&)> OutputCallback;
-
-  // If you don't need to stream JSON chunks out efficiently, and just want to
-  // get a complete JSON string after calling Finish, use this struct to collect
-  // JSON trace output.
-  struct BASE_EXPORT SimpleOutput {
-    OutputCallback GetCallback();
-    void Append(const std::string& json_string);
-
-    // Do what you want with the json_output_ string after calling
-    // TraceResultBuffer::Finish.
-    std::string json_output;
-  };
-
-  TraceResultBuffer();
-  ~TraceResultBuffer();
-
-  // Set callback. The callback will be called during Start with the initial
-  // JSON output and during AddFragment and Finish with following JSON output
-  // chunks. The callback target must live past the last calls to
-  // TraceResultBuffer::Start/AddFragment/Finish.
-  void SetOutputCallback(const OutputCallback& json_chunk_callback);
-
-  // Start JSON output. This resets all internal state, so you can reuse
-  // the TraceResultBuffer by calling Start.
-  void Start();
-
-  // Call AddFragment 0 or more times to add trace fragments from TraceLog.
-  void AddFragment(const std::string& trace_fragment);
-
-  // When all fragments have been added, call Finish to complete the JSON
-  // formatted output.
-  void Finish();
-
- private:
-  OutputCallback output_callback_;
-  bool append_comma_;
-};
-
-class BASE_EXPORT CategoryFilter {
- public:
-  typedef std::vector<std::string> StringList;
-
-  // The default category filter, used when none is provided.
-  // Allows all categories through, except if they end in the suffix 'Debug' or
-  // 'Test'.
-  static const char kDefaultCategoryFilterString[];
-
-  // |filter_string| is a comma-delimited list of category wildcards.
-  // A category can have an optional '-' prefix to make it an excluded category.
-  // All the same rules apply above, so for example, having both included and
-  // excluded categories in the same list would not be supported.
-  //
-  // Example: CategoryFilter"test_MyTest*");
-  // Example: CategoryFilter("test_MyTest*,test_OtherStuff");
-  // Example: CategoryFilter("-excluded_category1,-excluded_category2");
-  // Example: CategoryFilter("-*,webkit"); would disable everything but webkit.
-  // Example: CategoryFilter("-webkit"); would enable everything but webkit.
-  //
-  // Category filters can also be used to configure synthetic delays.
-  //
-  // Example: CategoryFilter("DELAY(gpu.PresentingFrame;16)"); would make swap
-  //          buffers always take at least 16 ms.
-  // Example: CategoryFilter("DELAY(gpu.PresentingFrame;16;oneshot)"); would
-  //          make swap buffers take at least 16 ms the first time it is
-  //          called.
-  // Example: CategoryFilter("DELAY(gpu.PresentingFrame;16;alternating)");
-  //          would make swap buffers take at least 16 ms every other time it
-  //          is called.
-  explicit CategoryFilter(const std::string& filter_string);
-
-  CategoryFilter();
-
-  CategoryFilter(const CategoryFilter& cf);
-
-  ~CategoryFilter();
-
-  CategoryFilter& operator=(const CategoryFilter& rhs);
-
-  // Writes the string representation of the CategoryFilter. This is a comma
-  // separated string, similar in nature to the one used to determine
-  // enabled/disabled category patterns, except here there is an arbitrary
-  // order, included categories go first, then excluded categories. Excluded
-  // categories are distinguished from included categories by the prefix '-'.
-  std::string ToString() const;
-
-  // Returns true if at least one category in the list is enabled by this
-  // category filter.
-  bool IsCategoryGroupEnabled(const char* category_group) const;
-
-  // Return a list of the synthetic delays specified in this category filter.
-  const StringList& GetSyntheticDelayValues() const;
-
-  // Merges nested_filter with the current CategoryFilter
-  void Merge(const CategoryFilter& nested_filter);
-
-  // Clears both included/excluded pattern lists. This would be equivalent to
-  // creating a CategoryFilter with an empty string, through the constructor.
-  // i.e: CategoryFilter().
-  //
-  // When using an empty filter, all categories are considered included as we
-  // are not excluding anything.
-  void Clear();
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(TraceEventTestFixture, CategoryFilter);
-
-  // Returns true if category is enable according to this filter.
-  bool IsCategoryEnabled(const char* category_name) const;
-
-  static bool IsEmptyOrContainsLeadingOrTrailingWhitespace(
-      const std::string& str);
-
-  void Initialize(const std::string& filter_string);
-  void WriteString(const StringList& values,
-                   std::string* out,
-                   bool included) const;
-  void WriteString(const StringList& delays, std::string* out) const;
-  bool HasIncludedPatterns() const;
-
-  StringList included_;
-  StringList disabled_;
-  StringList excluded_;
-  StringList delays_;
-};
-
-class TraceSamplingThread;
-
-// Options determines how the trace buffer stores data.
-enum TraceRecordMode {
-  // Record until the trace buffer is full.
-  RECORD_UNTIL_FULL,
-
-  // Record until the user ends the trace. The trace buffer is a fixed size
-  // and we use it as a ring buffer during recording.
-  RECORD_CONTINUOUSLY,
-
-  // Echo to console. Events are discarded.
-  ECHO_TO_CONSOLE,
-
-  // Record until the trace buffer is full, but with a huge buffer size.
-  RECORD_AS_MUCH_AS_POSSIBLE
-};
-
-struct BASE_EXPORT TraceOptions {
-  TraceOptions()
-      : record_mode(RECORD_UNTIL_FULL),
-        enable_sampling(false),
-        enable_systrace(false) {}
-
-  explicit TraceOptions(TraceRecordMode record_mode)
-      : record_mode(record_mode),
-        enable_sampling(false),
-        enable_systrace(false) {}
-
-  // |options_string| is a comma-delimited list of trace options.
-  // Possible options are: "record-until-full", "record-continuously",
-  // "trace-to-console", "enable-sampling" and "enable-systrace".
-  // The first 3 options are trace recoding modes and hence
-  // mutually exclusive. If more than one trace recording modes appear in the
-  // options_string, the last one takes precedence. If none of the trace
-  // recording mode is specified, recording mode is RECORD_UNTIL_FULL.
-  //
-  // The trace option will first be reset to the default option
-  // (record_mode set to RECORD_UNTIL_FULL, enable_sampling and enable_systrace
-  // set to false) before options parsed from |options_string| are applied on
-  // it.
-  // If |options_string| is invalid, the final state of trace_options is
-  // undefined.
-  //
-  // Example: trace_options.SetFromString("record-until-full")
-  // Example: trace_options.SetFromString(
-  //              "record-continuously, enable-sampling")
-  // Example: trace_options.SetFromString("record-until-full, trace-to-console")
-  // will set ECHO_TO_CONSOLE as the recording mode.
-  //
-  // Returns true on success.
-  bool SetFromString(const std::string& options_string);
-
-  std::string ToString() const;
-
-  TraceRecordMode record_mode;
-  bool enable_sampling;
-  bool enable_systrace;
-};
-
-struct BASE_EXPORT TraceLogStatus {
-  TraceLogStatus();
-  ~TraceLogStatus();
-  size_t event_capacity;
-  size_t event_count;
-};
-
-class BASE_EXPORT TraceLog {
- public:
-  enum Mode {
-    DISABLED = 0,
-    RECORDING_MODE,
-    MONITORING_MODE,
-  };
-
-  // The pointer returned from GetCategoryGroupEnabledInternal() points to a
-  // value with zero or more of the following bits. Used in this class only.
-  // The TRACE_EVENT macros should only use the value as a bool.
-  // These values must be in sync with macro values in TraceEvent.h in Blink.
-  enum CategoryGroupEnabledFlags {
-    // Category group enabled for the recording mode.
-    ENABLED_FOR_RECORDING = 1 << 0,
-    // Category group enabled for the monitoring mode.
-    ENABLED_FOR_MONITORING = 1 << 1,
-    // Category group enabled by SetEventCallbackEnabled().
-    ENABLED_FOR_EVENT_CALLBACK = 1 << 2,
-  };
-
-  static TraceLog* GetInstance();
-
-  // Get set of known category groups. This can change as new code paths are
-  // reached. The known category groups are inserted into |category_groups|.
-  void GetKnownCategoryGroups(std::vector<std::string>* category_groups);
-
-  // Retrieves a copy (for thread-safety) of the current CategoryFilter.
-  CategoryFilter GetCurrentCategoryFilter();
-
-  // Retrieves a copy (for thread-safety) of the current TraceOptions.
-  TraceOptions GetCurrentTraceOptions() const;
-
-  // Enables normal tracing (recording trace events in the trace buffer).
-  // See CategoryFilter comments for details on how to control what categories
-  // will be traced. If tracing has already been enabled, |category_filter| will
-  // be merged into the current category filter.
-  void SetEnabled(const CategoryFilter& category_filter,
-                  Mode mode, const TraceOptions& options);
-
-  // Disables normal tracing for all categories.
-  void SetDisabled();
-
-  bool IsEnabled() { return mode_ != DISABLED; }
-
-  // The number of times we have begun recording traces. If tracing is off,
-  // returns -1. If tracing is on, then it returns the number of times we have
-  // recorded a trace. By watching for this number to increment, you can
-  // passively discover when a new trace has begun. This is then used to
-  // implement the TRACE_EVENT_IS_NEW_TRACE() primitive.
-  int GetNumTracesRecorded();
-
-#if defined(OS_ANDROID)
-  void StartATrace();
-  void StopATrace();
-  void AddClockSyncMetadataEvent();
-#endif
-
-  // Enabled state listeners give a callback when tracing is enabled or
-  // disabled. This can be used to tie into other library's tracing systems
-  // on-demand.
-  class BASE_EXPORT EnabledStateObserver {
-   public:
-    // Called just after the tracing system becomes enabled, outside of the
-    // |lock_|. TraceLog::IsEnabled() is true at this point.
-    virtual void OnTraceLogEnabled() = 0;
-
-    // Called just after the tracing system disables, outside of the |lock_|.
-    // TraceLog::IsEnabled() is false at this point.
-    virtual void OnTraceLogDisabled() = 0;
-  };
-  void AddEnabledStateObserver(EnabledStateObserver* listener);
-  void RemoveEnabledStateObserver(EnabledStateObserver* listener);
-  bool HasEnabledStateObserver(EnabledStateObserver* listener) const;
-
-  TraceLogStatus GetStatus() const;
-  bool BufferIsFull() const;
-
-  // Not using base::Callback because of its limited by 7 parameters.
-  // Also, using primitive type allows directly passing callback from WebCore.
-  // WARNING: It is possible for the previously set callback to be called
-  // after a call to SetEventCallbackEnabled() that replaces or a call to
-  // SetEventCallbackDisabled() that disables the callback.
-  // This callback may be invoked on any thread.
-  // For TRACE_EVENT_PHASE_COMPLETE events, the client will still receive pairs
-  // of TRACE_EVENT_PHASE_BEGIN and TRACE_EVENT_PHASE_END events to keep the
-  // interface simple.
-  typedef void (*EventCallback)(TimeTicks timestamp,
-                                char phase,
-                                const unsigned char* category_group_enabled,
-                                const char* name,
-                                unsigned long long id,
-                                int num_args,
-                                const char* const arg_names[],
-                                const unsigned char arg_types[],
-                                const unsigned long long arg_values[],
-                                unsigned char flags);
-
-  // Enable tracing for EventCallback.
-  void SetEventCallbackEnabled(const CategoryFilter& category_filter,
-                               EventCallback cb);
-  void SetEventCallbackDisabled();
-
-  // Flush all collected events to the given output callback. The callback will
-  // be called one or more times either synchronously or asynchronously from
-  // the current thread with IPC-bite-size chunks. The string format is
-  // undefined. Use TraceResultBuffer to convert one or more trace strings to
-  // JSON. The callback can be null if the caller doesn't want any data.
-  // Due to the implementation of thread-local buffers, flush can't be
-  // done when tracing is enabled. If called when tracing is enabled, the
-  // callback will be called directly with (empty_string, false) to indicate
-  // the end of this unsuccessful flush.
-  typedef base::Callback<void(const scoped_refptr<base::RefCountedString>&,
-                              bool has_more_events)> OutputCallback;
-  void Flush(const OutputCallback& cb);
-  void FlushButLeaveBufferIntact(const OutputCallback& flush_output_callback);
-
-  // Called by TRACE_EVENT* macros, don't call this directly.
-  // The name parameter is a category group for example:
-  // TRACE_EVENT0("renderer,webkit", "WebViewImpl::HandleInputEvent")
-  static const unsigned char* GetCategoryGroupEnabled(const char* name);
-  static const char* GetCategoryGroupName(
-      const unsigned char* category_group_enabled);
-
-  // Called by TRACE_EVENT* macros, don't call this directly.
-  // If |copy| is set, |name|, |arg_name1| and |arg_name2| will be deep copied
-  // into the event; see "Memory scoping note" and TRACE_EVENT_COPY_XXX above.
-  TraceEventHandle AddTraceEvent(
-      char phase,
-      const unsigned char* category_group_enabled,
-      const char* name,
-      unsigned long long id,
-      int num_args,
-      const char** arg_names,
-      const unsigned char* arg_types,
-      const unsigned long long* arg_values,
-      const scoped_refptr<ConvertableToTraceFormat>* convertable_values,
-      unsigned char flags);
-  TraceEventHandle AddTraceEventWithThreadIdAndTimestamp(
-      char phase,
-      const unsigned char* category_group_enabled,
-      const char* name,
-      unsigned long long id,
-      int thread_id,
-      const TimeTicks& timestamp,
-      int num_args,
-      const char** arg_names,
-      const unsigned char* arg_types,
-      const unsigned long long* arg_values,
-      const scoped_refptr<ConvertableToTraceFormat>* convertable_values,
-      unsigned char flags);
-  static void AddTraceEventEtw(char phase,
-                               const char* category_group,
-                               const void* id,
-                               const char* extra);
-  static void AddTraceEventEtw(char phase,
-                               const char* category_group,
-                               const void* id,
-                               const std::string& extra);
-
-  void UpdateTraceEventDuration(const unsigned char* category_group_enabled,
-                                const char* name,
-                                TraceEventHandle handle);
-
-  // For every matching event, the callback will be called.
-  typedef base::Callback<void()> WatchEventCallback;
-  void SetWatchEvent(const std::string& category_name,
-                     const std::string& event_name,
-                     const WatchEventCallback& callback);
-  // Cancel the watch event. If tracing is enabled, this may race with the
-  // watch event notification firing.
-  void CancelWatchEvent();
-
-  int process_id() const { return process_id_; }
-
-  // Exposed for unittesting:
-
-  void WaitSamplingEventForTesting();
-
-  // Allows deleting our singleton instance.
-  static void DeleteForTesting();
-
-  // Allow tests to inspect TraceEvents.
-  TraceEvent* GetEventByHandle(TraceEventHandle handle);
-
-  void SetProcessID(int process_id);
-
-  // Process sort indices, if set, override the order of a process will appear
-  // relative to other processes in the trace viewer. Processes are sorted first
-  // on their sort index, ascending, then by their name, and then tid.
-  void SetProcessSortIndex(int sort_index);
-
-  // Sets the name of the process.
-  void SetProcessName(const std::string& process_name);
-
-  // Processes can have labels in addition to their names. Use labels, for
-  // instance, to list out the web page titles that a process is handling.
-  void UpdateProcessLabel(int label_id, const std::string& current_label);
-  void RemoveProcessLabel(int label_id);
-
-  // Thread sort indices, if set, override the order of a thread will appear
-  // within its process in the trace viewer. Threads are sorted first on their
-  // sort index, ascending, then by their name, and then tid.
-  void SetThreadSortIndex(PlatformThreadId , int sort_index);
-
-  // Allow setting an offset between the current TimeTicks time and the time
-  // that should be reported.
-  void SetTimeOffset(TimeDelta offset);
-
-  size_t GetObserverCountForTest() const;
-
-  // Call this method if the current thread may block the message loop to
-  // prevent the thread from using the thread-local buffer because the thread
-  // may not handle the flush request in time causing lost of unflushed events.
-  void SetCurrentThreadBlocksMessageLoop();
-
- private:
-  typedef unsigned int InternalTraceOptions;
-
-  FRIEND_TEST_ALL_PREFIXES(TraceEventTestFixture,
-                           TraceBufferRingBufferGetReturnChunk);
-  FRIEND_TEST_ALL_PREFIXES(TraceEventTestFixture,
-                           TraceBufferRingBufferHalfIteration);
-  FRIEND_TEST_ALL_PREFIXES(TraceEventTestFixture,
-                           TraceBufferRingBufferFullIteration);
-  FRIEND_TEST_ALL_PREFIXES(TraceEventTestFixture,
-                           TraceBufferVectorReportFull);
-  FRIEND_TEST_ALL_PREFIXES(TraceEventTestFixture,
-                           ConvertTraceOptionsToInternalOptions);
-  FRIEND_TEST_ALL_PREFIXES(TraceEventTestFixture,
-                           TraceRecordAsMuchAsPossibleMode);
-
-  // This allows constructor and destructor to be private and usable only
-  // by the Singleton class.
-  friend struct DefaultSingletonTraits<TraceLog>;
-
-  // Enable/disable each category group based on the current mode_,
-  // category_filter_, event_callback_ and event_callback_category_filter_.
-  // Enable the category group in the enabled mode if category_filter_ matches
-  // the category group, or event_callback_ is not null and
-  // event_callback_category_filter_ matches the category group.
-  void UpdateCategoryGroupEnabledFlags();
-  void UpdateCategoryGroupEnabledFlag(size_t category_index);
-
-  // Configure synthetic delays based on the values set in the current
-  // category filter.
-  void UpdateSyntheticDelaysFromCategoryFilter();
-
-  InternalTraceOptions GetInternalOptionsFromTraceOptions(
-      const TraceOptions& options);
-
-  class ThreadLocalEventBuffer;
-  class OptionalAutoLock;
-
-  TraceLog();
-  ~TraceLog();
-  const unsigned char* GetCategoryGroupEnabledInternal(const char* name);
-  void AddMetadataEventsWhileLocked();
-
-  InternalTraceOptions trace_options() const {
-    return static_cast<InternalTraceOptions>(
-        subtle::NoBarrier_Load(&trace_options_));
-  }
-
-  TraceBuffer* trace_buffer() const { return logged_events_.get(); }
-  TraceBuffer* CreateTraceBuffer();
-  TraceBuffer* CreateTraceBufferVectorOfSize(size_t max_chunks);
-
-  std::string EventToConsoleMessage(unsigned char phase,
-                                    const TimeTicks& timestamp,
-                                    TraceEvent* trace_event);
-
-  TraceEvent* AddEventToThreadSharedChunkWhileLocked(TraceEventHandle* handle,
-                                                     bool check_buffer_is_full);
-  void CheckIfBufferIsFullWhileLocked();
-  void SetDisabledWhileLocked();
-
-  TraceEvent* GetEventByHandleInternal(TraceEventHandle handle,
-                                       OptionalAutoLock* lock);
-
-  // |generation| is used in the following callbacks to check if the callback
-  // is called for the flush of the current |logged_events_|.
-  void FlushCurrentThread(int generation);
-  void ConvertTraceEventsToTraceFormat(scoped_ptr<TraceBuffer> logged_events,
-      const TraceLog::OutputCallback& flush_output_callback);
-  void FinishFlush(int generation);
-  void OnFlushTimeout(int generation);
-
-  int generation() const {
-    return static_cast<int>(subtle::NoBarrier_Load(&generation_));
-  }
-  bool CheckGeneration(int generation) const {
-    return generation == this->generation();
-  }
-  void UseNextTraceBuffer();
-
-  TimeTicks OffsetNow() const {
-    return OffsetTimestamp(TimeTicks::NowFromSystemTraceTime());
-  }
-  TimeTicks OffsetTimestamp(const TimeTicks& timestamp) const {
-    return timestamp - time_offset_;
-  }
-
-  // Internal representation of trace options since we store the currently used
-  // trace option as an AtomicWord.
-  static const InternalTraceOptions kInternalNone;
-  static const InternalTraceOptions kInternalRecordUntilFull;
-  static const InternalTraceOptions kInternalRecordContinuously;
-  static const InternalTraceOptions kInternalEchoToConsole;
-  static const InternalTraceOptions kInternalEnableSampling;
-  static const InternalTraceOptions kInternalRecordAsMuchAsPossible;
-
-  // This lock protects TraceLog member accesses (except for members protected
-  // by thread_info_lock_) from arbitrary threads.
-  mutable Lock lock_;
-  // This lock protects accesses to thread_names_, thread_event_start_times_
-  // and thread_colors_.
-  Lock thread_info_lock_;
-  Mode mode_;
-  int num_traces_recorded_;
-  scoped_ptr<TraceBuffer> logged_events_;
-  subtle::AtomicWord /* EventCallback */ event_callback_;
-  bool dispatching_to_observer_list_;
-  std::vector<EnabledStateObserver*> enabled_state_observer_list_;
-
-  std::string process_name_;
-  base::hash_map<int, std::string> process_labels_;
-  int process_sort_index_;
-  base::hash_map<int, int> thread_sort_indices_;
-  base::hash_map<int, std::string> thread_names_;
-
-  // The following two maps are used only when ECHO_TO_CONSOLE.
-  base::hash_map<int, std::stack<TimeTicks> > thread_event_start_times_;
-  base::hash_map<std::string, int> thread_colors_;
-
-  TimeTicks buffer_limit_reached_timestamp_;
-
-  // XORed with TraceID to make it unlikely to collide with other processes.
-  unsigned long long process_id_hash_;
-
-  int process_id_;
-
-  TimeDelta time_offset_;
-
-  // Allow tests to wake up when certain events occur.
-  WatchEventCallback watch_event_callback_;
-  subtle::AtomicWord /* const unsigned char* */ watch_category_;
-  std::string watch_event_name_;
-
-  subtle::AtomicWord /* Options */ trace_options_;
-
-  // Sampling thread handles.
-  scoped_ptr<TraceSamplingThread> sampling_thread_;
-  PlatformThreadHandle sampling_thread_handle_;
-
-  CategoryFilter category_filter_;
-  CategoryFilter event_callback_category_filter_;
-
-  ThreadLocalPointer<ThreadLocalEventBuffer> thread_local_event_buffer_;
-  ThreadLocalBoolean thread_blocks_message_loop_;
-  ThreadLocalBoolean thread_is_in_trace_event_;
-
-  // Contains the message loops of threads that have had at least one event
-  // added into the local event buffer. Not using MessageLoopProxy because we
-  // need to know the life time of the message loops.
-  hash_set<MessageLoop*> thread_message_loops_;
-
-  // For events which can't be added into the thread local buffer, e.g. events
-  // from threads without a message loop.
-  scoped_ptr<TraceBufferChunk> thread_shared_chunk_;
-  size_t thread_shared_chunk_index_;
-
-  // Set when asynchronous Flush is in progress.
-  OutputCallback flush_output_callback_;
-  scoped_refptr<MessageLoopProxy> flush_message_loop_proxy_;
-  subtle::AtomicWord generation_;
-
-  DISALLOW_COPY_AND_ASSIGN(TraceLog);
-};
-
-}  // namespace debug
-}  // namespace base
+#include "base/trace_event/trace_event_impl.h"
 
 #endif  // BASE_DEBUG_TRACE_EVENT_IMPL_H_