V4L2VDA: Generalize EGLImage import and query driver for output formats.

content/common/gpu/media/v4l2_video_decode_accelerator.h

Index: content/common/gpu/media/v4l2_video_decode_accelerator.h
diff --git a/content/common/gpu/media/v4l2_video_decode_accelerator.h b/content/common/gpu/media/v4l2_video_decode_accelerator.h
index 01714791442601555ef92bb99d66346b5ad89240..9eb04feb8fa203f46f9b6c13594ee91fc83002f2 100644
--- a/content/common/gpu/media/v4l2_video_decode_accelerator.h
+++ b/content/common/gpu/media/v4l2_video_decode_accelerator.h
@@ -275,6 +275,10 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
   bool CreateInputBuffers();
   bool CreateOutputBuffers();
 
+  // Query the hardware for a suitable format that we can use for
+  // importing into EGLImages for output, and set it.
+  bool SetupOutputFormat();
+
   //
   // Methods run on child thread.
   //
@@ -398,7 +402,8 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
   std::vector<OutputRecord> output_buffer_map_;
   // Required size of DPB for decoding.
   int output_dpb_size_;
-  // Stores the number of planes (i.e. separate memory buffers) for output.
+
+  // Number of planes (i.e. separate memory buffers) for output.
   size_t output_planes_count_;
 
   // Pictures that are ready but not sent to PictureReady yet.
@@ -434,6 +439,8 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
 
   // The codec we'll be decoding for.
   media::VideoCodecProfile video_profile_;
+  // Chosen output format.
+  uint32_t output_format_fourcc_;
 
   // The WeakPtrFactory for |weak_this_|.
   base::WeakPtrFactory<V4L2VideoDecodeAccelerator> weak_this_factory_;