Add support for Tegra V4L2 VDA

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 0c6a4930714de29f9a10d33975255dc90d011f26..6a191ac6dcf495890d9b98c9d86a3a207292de72 100644
--- a/content/common/gpu/media/v4l2_video_decode_accelerator.h
+++ b/content/common/gpu/media/v4l2_video_decode_accelerator.h
@@ -155,7 +155,6 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
     ~OutputRecord();
     bool at_device;         // held by device.
     bool at_client;         // held by client.
-    int fds[2];             // file descriptors for each plane.
     EGLImageKHR egl_image;  // EGLImageKHR for the output buffer.
     EGLSyncKHR egl_sync;    // sync the compositor's use of the EGLImage.
     int32 picture_id;       // picture buffer id as returned to PictureReady().
@@ -294,6 +293,12 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
   // Callback that indicates a picture has been cleared.
   void PictureCleared();
 
+  // This method determines whether a resolution change event processing
+  // is indeed required by returning true iff:
+  // - width or height of the new format is different than previous format; or
+  // - V4L2_CID_MIN_BUFFERS_FOR_CAPTURE has changed.
+  bool IsResolutionChangeNecessary();
+
   // Our original calling message loop for the child thread.
   scoped_refptr<base::MessageLoopProxy> child_message_loop_proxy_;
 
@@ -362,9 +367,10 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
   //
   // Hardware state and associated queues.  Since decoder_thread_ services
   // the hardware, decoder_thread_ owns these too.
-  // output_buffer_map_ and free_output_buffers_ are an exception during the
-  // buffer (re)allocation sequence, when the decoder_thread_ is blocked briefly
-  // while the Child thread manipulates them.
+  // output_buffer_map_, free_output_buffers_ and output_planes_count_ are an
+  // exception during the buffer (re)allocation sequence, when the
+  // decoder_thread_ is blocked briefly while the Child thread manipulates
+  // them.
   //
 
   // Completed decode buffers.
@@ -392,6 +398,8 @@ class CONTENT_EXPORT V4L2VideoDecodeAccelerator
   uint32 output_buffer_pixelformat_;
   // Required size of DPB for decoding.
   int output_dpb_size_;
+  // Stores the 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.
   std::queue<PictureRecord> pending_picture_ready_;