Add end-to-end test for ColorSpace information

Bug: webrtc:8651
Change-Id: Ib7f6162c8dd41868b7d7acca8a6292b2d911c520
Reviewed-on: https://webrtc-review.googlesource.com/c/113941
Commit-Queue: Johannes Kron <kron@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25992}

test/constants.cc

@@ -21,6 +21,7 @@ const int kVideoRotationExtensionId = 9;
 const int kVideoContentTypeExtensionId = 10;
 const int kVideoTimingExtensionId = 11;
 const int kGenericDescriptorExtensionId = 12;
+const int kColorSpaceExtensionId = 13;
 
 }  // namespace test
 }  // namespace webrtc