Replace media::Limits struct with media::limits namespace and update documentation.

media/base/buffers.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.
 
 // Defines various types of timestamped media buffers used for transporting
 // data between filters.  Every buffer contains a timestamp in microseconds
 // describing the relative position of the buffer within the media stream, and
 // the duration in microseconds for the length of time the buffer will be
 // rendered.
 //
@@ skipping 19 matching lines @@
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 // Indicates an invalid or missing timestamp.
 MEDIA_EXPORT extern const base::TimeDelta kNoTimestamp;
 
+// Represents an infinite stream duration.
+MEDIA_EXPORT extern const base::TimeDelta kInfiniteDuration;
+
 class MEDIA_EXPORT StreamSample
     : public base::RefCountedThreadSafe<StreamSample> {
  public:
   // Returns the timestamp of this buffer in microseconds.
   base::TimeDelta GetTimestamp() const {
     return timestamp_;
   }
 
   // Returns the duration of this buffer in microseconds.
   base::TimeDelta GetDuration() const {
@@ skipping 39 matching lines @@
   // If there's no data in this buffer, it represents end of stream.
   virtual bool IsEndOfStream() const OVERRIDE;
 
  protected:
   virtual ~Buffer() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_BUFFERS_H_