Add powerEfficientDecoder and powerEfficientEncoder stats

The spec for these are at https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-powerefficientdecoder and https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-powerefficientdecoder

These stats are based on the is_hardware_accelerated boolean in both the
DecoderInfo and EncoderInfo structs.

Bug: webrtc:14483
Change-Id: I4610da3c6ae977f5853a3b3424d91d864fe72592
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/274409
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Evan Shrubsole <eshr@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38441}
diff --git a/video/BUILD.gn b/video/BUILD.gn
index 24ca9a1..169b485 100644
--- a/video/BUILD.gn
+++ b/video/BUILD.gn
@@ -809,6 +809,7 @@
       ":video_stream_buffer_controller",
       ":video_stream_decoder_impl",
       ":video_stream_encoder_impl",
+      ":video_stream_encoder_interface",
       "../api:create_frame_generator",
       "../api:fake_frame_decryptor",
       "../api:fake_frame_encryptor",