Introduce a client minimum picture pool size

content/common/gpu/media/dxva_video_decode_accelerator.h

Index: content/common/gpu/media/dxva_video_decode_accelerator.h
diff --git a/content/common/gpu/media/dxva_video_decode_accelerator.h b/content/common/gpu/media/dxva_video_decode_accelerator.h
index 918531dc988f1b687c172d75611bc2053a476c80..25103fcafc5c617bc42126da955620d5b1c22575 100644
--- a/content/common/gpu/media/dxva_video_decode_accelerator.h
+++ b/content/common/gpu/media/dxva_video_decode_accelerator.h
@@ -64,6 +64,7 @@ class CONTENT_EXPORT DXVAVideoDecodeAccelerator
 
   // media::VideoDecodeAccelerator implementation.
   bool Initialize(media::VideoCodecProfile profile,
+                  uint32 min_picture_count,
                   Client* client) override;
   void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
   void AssignPictureBuffers(
@@ -308,6 +309,9 @@ class CONTENT_EXPORT DXVAVideoDecodeAccelerator
   // become available.
   OutputBuffers stale_output_picture_buffers_;
 
+  // The number of picture buffers to allocate
+  uint32 num_picture_buffers_;
+
   // Set to true if we requested picture slots from the client.
   bool pictures_requested_;