Expose codec implementation names in stats.

webrtc/video/video_encoder_unittest.cc

Index: webrtc/video/video_encoder_unittest.cc
diff --git a/webrtc/video/video_encoder_unittest.cc b/webrtc/video/video_encoder_unittest.cc
index f84835620bf51eb94bc9e98f04fc8ac9d6372f04..ea90820030871a917f54b75202b26d7847f63ba7 100644
--- a/webrtc/video/video_encoder_unittest.cc
+++ b/webrtc/video/video_encoder_unittest.cc
@@ -67,6 +67,10 @@ class VideoEncoderSoftwareFallbackWrapperTest : public ::testing::Test {
       return false;
     }
 
+    const char* ImplementationName() const override {
+      return "fake-encoder";
+    }
+
     int init_encode_count_ = 0;
     int32_t init_encode_return_code_ = WEBRTC_VIDEO_CODEC_OK;
     int32_t encode_return_code_ = WEBRTC_VIDEO_CODEC_OK;
@@ -259,4 +263,13 @@ TEST_F(VideoEncoderSoftwareFallbackWrapperTest,
   EXPECT_EQ(WEBRTC_VIDEO_CODEC_OK, fallback_wrapper_.Release());
 }
 
+TEST_F(VideoEncoderSoftwareFallbackWrapperTest,
+       ReportsFallbackImplementationName) {
+  UtilizeFallbackEncoder();
+  // Hard coded expected value since libvpx is the software implementation name
+  // for VP8. Change accordingly if the underlying implementation does.
+  EXPECT_STREQ("libvpx (fallback from: fake-encoder)",
+               fallback_wrapper_.ImplementationName());
+}
+
 }  // namespace webrtc