Introduce a client minimum picture pool size

content/common/gpu/media/vaapi_video_decode_accelerator.h

Index: content/common/gpu/media/vaapi_video_decode_accelerator.h
diff --git a/content/common/gpu/media/vaapi_video_decode_accelerator.h b/content/common/gpu/media/vaapi_video_decode_accelerator.h
index 268439b96bc4dad249401bf99f5570dda48862bc..7e82476e98a3c84d5cc63939701a1b14b0d3b543 100644
--- a/content/common/gpu/media/vaapi_video_decode_accelerator.h
+++ b/content/common/gpu/media/vaapi_video_decode_accelerator.h
@@ -57,7 +57,10 @@ class CONTENT_EXPORT VaapiVideoDecodeAccelerator
   ~VaapiVideoDecodeAccelerator() override;
 
   // media::VideoDecodeAccelerator implementation.
-  bool Initialize(media::VideoCodecProfile profile, Client* client) override;
+  bool Initialize(
+      media::VideoCodecProfile profile,
+      uint32 min_picture_count,
+      Client* client) override;
   void Decode(const media::BitstreamBuffer& bitstream_buffer) override;
   void AssignPictureBuffers(
       const std::vector<media::PictureBuffer>& buffers) override;
@@ -299,6 +302,9 @@ class CONTENT_EXPORT VaapiVideoDecodeAccelerator
   size_t requested_num_pics_;
   gfx::Size requested_pic_size_;
 
+  // The minimum picture buffer count to allocate.
+  uint32 min_picture_count_;
+
   // Binds the provided GLImage to a givenr client texture ID & texture target
   // combination in GLES.
   base::Callback<void(uint32, uint32, scoped_refptr<gfx::GLImage>)> bind_image_;