Add live mode detection in WebM MediaSource parser.

media/base/video_decoder_config.h

Index: media/base/video_decoder_config.h
diff --git a/media/base/video_decoder_config.h b/media/base/video_decoder_config.h
index 3cc33d927158a5c279c2e91b0e5dbd9aad6467e1..4c86e0bea729ff973abb0c4bd4fb7353f25b1cb2 100644
--- a/media/base/video_decoder_config.h
+++ b/media/base/video_decoder_config.h
@@ -81,7 +81,8 @@ class MEDIA_EXPORT VideoDecoderConfig {
                      const gfx::Rect& visible_rect,
                      const gfx::Size& natural_size,
                      const uint8* extra_data, size_t extra_data_size,
-                     bool is_encrypted);
+                     bool is_encrypted,
+                     bool live_mode);
 
   ~VideoDecoderConfig();
 
@@ -94,6 +95,7 @@ class MEDIA_EXPORT VideoDecoderConfig {
                   const gfx::Size& natural_size,
                   const uint8* extra_data, size_t extra_data_size,
                   bool is_encrypted,
+                  bool live_mode,
                   bool record_stats);
 
   // Returns true if this object has appropriate configuration values, false
@@ -135,6 +137,10 @@ class MEDIA_EXPORT VideoDecoderConfig {
   // can be encrypted or not encrypted.
   bool is_encrypted() const;
 
+  // True when the stream is a live stream. Decoders may use this flag e.g. to
+  // minimize decoding delay for live streams.
+  bool live_mode() const;
+
  private:
   VideoCodec codec_;
   VideoCodecProfile profile_;
@@ -149,6 +155,8 @@ class MEDIA_EXPORT VideoDecoderConfig {
 
   bool is_encrypted_;
 
+  bool live_mode_;
+
   // Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler
   // generated copy constructor and assignment operator. Since the extra data is
   // typically small, the performance impact is minimal.