Shrink trace_event buffers

base/debug/trace_event_impl.h

 // 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.
 
 
 #ifndef BASE_DEBUG_TRACE_EVENT_IMPL_H_
 #define BASE_DEBUG_TRACE_EVENT_IMPL_H_
 
 #include <stack>
 #include <string>
@@ skipping 132 matching lines @@
  public:
   virtual ~TraceBuffer() {}
 
   virtual void AddEvent(const TraceEvent& event) = 0;
   virtual bool HasMoreEvents() const = 0;
   virtual const TraceEvent& NextEvent() = 0;
   virtual bool IsFull() const = 0;
   virtual size_t CountEnabledByName(const unsigned char* category,
                                     const std::string& event_name) const = 0;
   virtual size_t Size() const = 0;
+  virtual size_t Capacity() const = 0;
   virtual const TraceEvent& GetEventAt(size_t index) 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
@@ skipping 423 matching lines @@
 
   CategoryFilter category_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceLog);
 };
 
 }  // namespace debug
 }  // namespace base
 
 #endif  // BASE_DEBUG_TRACE_EVENT_IMPL_H_