Rename VideoFrameMetadata tests to RTPVideoHeaderTest.

This is a pure move/rename. The reason for wanting the tests in
RTPVideoHeader is that it is the GetAsMetadata() function that we are
testing and in a future CL we'll also want to test SetFromMetadata().

// Bots green, no need to wait for the remaining ones, just a move
NOTRY=True

Bug: webrtc:14709
Change-Id: Iecb938e79e7e8d55e208baea190eef4c6730158e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/285460
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38764}
diff --git a/api/video/BUILD.gn b/api/video/BUILD.gn
index 5cd543e..d65f641 100644
--- a/api/video/BUILD.gn
+++ b/api/video/BUILD.gn
@@ -403,10 +403,7 @@
 if (rtc_include_tests) {
   rtc_library("video_unittests") {
     testonly = true
-    sources = [
-      "video_frame_metadata_unittest.cc",
-      "video_stream_decoder_create_unittest.cc",
-    ]
+    sources = [ "video_stream_decoder_create_unittest.cc" ]
     deps = [
       ":video_frame_metadata",
       ":video_frame_type",
diff --git a/modules/rtp_rtcp/BUILD.gn b/modules/rtp_rtcp/BUILD.gn
index a23f595..843d2f2 100644
--- a/modules/rtp_rtcp/BUILD.gn
+++ b/modules/rtp_rtcp/BUILD.gn
@@ -437,6 +437,17 @@
   ]
 }
 
+rtc_source_set("rtp_video_header_unittest") {
+  testonly = true
+  sources = [ "source/rtp_video_header_unittest.cc" ]
+  deps = [
+    ":rtp_video_header",
+    "../../api/video:video_frame_metadata",
+    "../../api/video:video_frame_type",
+    "../../test:test_support",
+  ]
+}
+
 rtc_library("fec_test_helper") {
   testonly = true
   sources = [
@@ -604,6 +615,7 @@
       ":rtp_rtcp",
       ":rtp_rtcp_format",
       ":rtp_rtcp_legacy",
+      ":rtp_video_header_unittest",
       "../../api:array_view",
       "../../api:create_time_controller",
       "../../api:field_trials_registry",
diff --git a/api/video/video_frame_metadata_unittest.cc b/modules/rtp_rtcp/source/rtp_video_header_unittest.cc
similarity index 75%
rename from api/video/video_frame_metadata_unittest.cc
rename to modules/rtp_rtcp/source/rtp_video_header_unittest.cc
index 1dd39e9..c8439e1 100644
--- a/api/video/video_frame_metadata_unittest.cc
+++ b/modules/rtp_rtcp/source/rtp_video_header_unittest.cc
@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *  Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
@@ -8,10 +8,10 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include "api/video/video_frame_metadata.h"
-
-#include "api/video/video_frame_type.h"
 #include "modules/rtp_rtcp/source/rtp_video_header.h"
+
+#include "api/video/video_frame_metadata.h"
+#include "api/video/video_frame_type.h"
 #include "test/gmock.h"
 #include "test/gtest.h"
 
@@ -21,45 +21,42 @@
 using ::testing::ElementsAre;
 using ::testing::IsEmpty;
 
-// TODO(https://crbug.com/webrtc/14709): Move all of these tests to
-// rtp_video_header_unittest.cc, they're excercising GetAsMetadata().
-
-TEST(VideoFrameMetadata, GetFrameTypeReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetFrameType) {
   RTPVideoHeader video_header;
   video_header.frame_type = VideoFrameType::kVideoFrameKey;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   EXPECT_EQ(metadata.GetFrameType(), VideoFrameType::kVideoFrameKey);
 }
 
-TEST(VideoFrameMetadata, GetWidthReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetWidth) {
   RTPVideoHeader video_header;
   video_header.width = 1280u;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   EXPECT_EQ(metadata.GetWidth(), video_header.width);
 }
 
-TEST(VideoFrameMetadata, GetHeightReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetHeight) {
   RTPVideoHeader video_header;
   video_header.height = 720u;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   EXPECT_EQ(metadata.GetHeight(), video_header.height);
 }
 
-TEST(VideoFrameMetadata, GetRotationReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetRotation) {
   RTPVideoHeader video_header;
   video_header.rotation = VideoRotation::kVideoRotation_90;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   EXPECT_EQ(metadata.GetRotation(), VideoRotation::kVideoRotation_90);
 }
 
-TEST(VideoFrameMetadata, GetContentTypeReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetContentType) {
   RTPVideoHeader video_header;
   video_header.content_type = VideoContentType::SCREENSHARE;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   EXPECT_EQ(metadata.GetContentType(), VideoContentType::SCREENSHARE);
 }
 
-TEST(VideoFrameMetadata, GetFrameIdReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetFrameId) {
   RTPVideoHeader video_header;
   RTPVideoHeader::GenericDescriptorInfo& generic =
       video_header.generic.emplace();
@@ -68,14 +65,14 @@
   EXPECT_EQ(metadata.GetFrameId().value(), 10);
 }
 
-TEST(VideoFrameMetadata, HasNoFrameIdForHeaderWithoutGeneric) {
+TEST(RTPVideoHeaderTest, GetAsMetadataHasNoFrameIdForHeaderWithoutGeneric) {
   RTPVideoHeader video_header;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   ASSERT_FALSE(video_header.generic);
-  EXPECT_EQ(metadata.GetFrameId(), absl::nullopt);
+  EXPECT_FALSE(metadata.GetFrameId().has_value());
 }
 
-TEST(VideoFrameMetadata, GetSpatialIndexReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetSpatialIndex) {
   RTPVideoHeader video_header;
   RTPVideoHeader::GenericDescriptorInfo& generic =
       video_header.generic.emplace();
@@ -84,14 +81,15 @@
   EXPECT_EQ(metadata.GetSpatialIndex(), 2);
 }
 
-TEST(VideoFrameMetadata, SpatialIndexIsZeroForHeaderWithoutGeneric) {
+TEST(RTPVideoHeaderTest,
+     GetAsMetadataSpatialIndexIsZeroForHeaderWithoutGeneric) {
   RTPVideoHeader video_header;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   ASSERT_FALSE(video_header.generic);
   EXPECT_EQ(metadata.GetSpatialIndex(), 0);
 }
 
-TEST(VideoFrameMetadata, GetTemporalIndexReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetTemporalIndex) {
   RTPVideoHeader video_header;
   RTPVideoHeader::GenericDescriptorInfo& generic =
       video_header.generic.emplace();
@@ -100,14 +98,15 @@
   EXPECT_EQ(metadata.GetTemporalIndex(), 3);
 }
 
-TEST(VideoFrameMetadata, TemporalIndexIsZeroForHeaderWithoutGeneric) {
+TEST(RTPVideoHeaderTest,
+     GetAsMetadataTemporalIndexIsZeroForHeaderWithoutGeneric) {
   RTPVideoHeader video_header;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   ASSERT_FALSE(video_header.generic);
   EXPECT_EQ(metadata.GetTemporalIndex(), 0);
 }
 
-TEST(VideoFrameMetadata, GetFrameDependenciesReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetFrameDependencies) {
   RTPVideoHeader video_header;
   RTPVideoHeader::GenericDescriptorInfo& generic =
       video_header.generic.emplace();
@@ -116,14 +115,15 @@
   EXPECT_THAT(metadata.GetFrameDependencies(), ElementsAre(5, 6, 7));
 }
 
-TEST(VideoFrameMetadata, FrameDependencyVectorIsEmptyForHeaderWithoutGeneric) {
+TEST(RTPVideoHeaderTest,
+     GetAsMetadataFrameDependencyIsEmptyForHeaderWithoutGeneric) {
   RTPVideoHeader video_header;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   ASSERT_FALSE(video_header.generic);
   EXPECT_THAT(metadata.GetFrameDependencies(), IsEmpty());
 }
 
-TEST(VideoFrameMetadata, GetDecodeTargetIndicationsReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetDecodeTargetIndications) {
   RTPVideoHeader video_header;
   RTPVideoHeader::GenericDescriptorInfo& generic =
       video_header.generic.emplace();
@@ -133,29 +133,29 @@
               ElementsAre(DecodeTargetIndication::kSwitch));
 }
 
-TEST(VideoFrameMetadata,
-     DecodeTargetIndicationsVectorIsEmptyForHeaderWithoutGeneric) {
+TEST(RTPVideoHeaderTest,
+     GetAsMetadataGetDecodeTargetIndicationsIsEmptyForHeaderWithoutGeneric) {
   RTPVideoHeader video_header;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   ASSERT_FALSE(video_header.generic);
   EXPECT_THAT(metadata.GetDecodeTargetIndications(), IsEmpty());
 }
 
-TEST(VideoFrameMetadata, GetIsLastFrameInPictureReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetIsLastFrameInPicture) {
   RTPVideoHeader video_header;
   video_header.is_last_frame_in_picture = false;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   EXPECT_FALSE(metadata.GetIsLastFrameInPicture());
 }
 
-TEST(VideoFrameMetadata, GetSimulcastIdxReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetSimulcastIdx) {
   RTPVideoHeader video_header;
   video_header.simulcastIdx = 123;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();
   EXPECT_EQ(metadata.GetSimulcastIdx(), 123);
 }
 
-TEST(VideoFrameMetadata, GetCodecReturnsCorrectValue) {
+TEST(RTPVideoHeaderTest, GetAsMetadataGetCodec) {
   RTPVideoHeader video_header;
   video_header.codec = VideoCodecType::kVideoCodecVP9;
   VideoFrameMetadata metadata = video_header.GetAsMetadata();