Make the assumption on the minimum buffer size for GetLogLines explicit.

include/v8.h

 // Copyright 2007-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2404 matching lines @@
    * \param from_pos specified a point in a buffer to read from, 0 is the
    *   beginning of a buffer. It is assumed that caller updates its current
    *   position using returned size value from the previous call.
    * \param dest_buf destination buffer for log data.
    * \param max_size size of the destination buffer.
    * \returns actual size of log data copied into buffer.
    */
   static int GetLogLines(int from_pos, char* dest_buf, int max_size);
 
   /**
+   * The minimum allowed size for a log lines buffer.  If the size of
+   * the buffer given will not be enough to hold a line of the maximum
+   * length, an attempt to find a log line end in GetLogLines will
+   * fail, and an empty result will be returned.
+   */
+  static const int kMinimumSizeForLogLinesBuffer = 2048;
+
+  /**
    * Retrieve the V8 thread id of the calling thread.
    *
    * The thread id for a thread should only be retrieved after the V8
    * lock has been acquired with a Locker object with that thread.
    */
   static int GetCurrentThreadId();
 
   /**
    * Forcefully terminate execution of a JavaScript thread.  This can
    * be used to terminate long-running scripts.
@@ skipping 880 matching lines @@
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef V8EXPORT_INLINE
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_