Work on flexible mode and screen sharing.

webrtc/video/video_send_stream_tests.cc

Index: webrtc/video/video_send_stream_tests.cc
diff --git a/webrtc/video/video_send_stream_tests.cc b/webrtc/video/video_send_stream_tests.cc
index c55809955723e50953d0adce8026c32050ea400c..163619b1e0cd3bcc136cf5546ad1c5ab46e6fecb 100644
--- a/webrtc/video/video_send_stream_tests.cc
+++ b/webrtc/video/video_send_stream_tests.cc
@@ -1821,6 +1821,7 @@ class VP9HeaderObeserver : public test::SendTest {
                      std::vector<VideoReceiveStream::Config>* receive_configs,
                      VideoEncoderConfig* encoder_config) override {
     encoder_config->encoder_specific_settings = &vp9_settings_;
+    encoder_config->content_type = VideoEncoderConfig::ContentType::kScreen;
     send_config->encoder_settings.encoder = vp9_encoder_.get();
     send_config->encoder_settings.payload_name = "VP9";
     send_config->encoder_settings.payload_type = kVp9PayloadType;
@@ -1891,10 +1892,70 @@ TEST_F(VideoSendStreamTest, DISABLED_VP9FlexMode) {
       EXPECT_TRUE(vp9videoHeader->flexible_mode);
       observation_complete_->Set();
     }
+  } test;
+
+  RunBaseTest(&test);
+}
+
+TEST_F(VideoSendStreamTest, VP9FlexModeHasPictureId) {
+  class FlexibleMode : public VP9HeaderObeserver {
+    void ModifyConfigsHook(
+        VideoSendStream::Config* send_config,
+        std::vector<VideoReceiveStream::Config>* receive_configs,
+        VideoEncoderConfig* encoder_config) override {
+      vp9_settings_.flexibleMode = true;
+    }
+
+    void InspectHeader(RTPVideoHeaderVP9* vp9videoHeader) override {
+      EXPECT_NE(vp9videoHeader->picture_id, kNoPictureId);
+      observation_complete_->Set();
+    }
+  } test;
+
+  RunBaseTest(&test);
+}
+
+TEST_F(VideoSendStreamTest, VP9FlexModeRefCount) {
+  class FlexibleMode : public VP9HeaderObeserver {
+    void ModifyConfigsHook(
+        VideoSendStream::Config* send_config,
+        std::vector<VideoReceiveStream::Config>* receive_configs,
+        VideoEncoderConfig* encoder_config) override {
+      vp9_settings_.flexibleMode = true;
+    }
+
+    void InspectHeader(RTPVideoHeaderVP9* vp9videoHeader) override {
+      EXPECT_TRUE(vp9videoHeader->flexible_mode);
+      if (vp9videoHeader->inter_pic_predicted) {
+        EXPECT_GT(vp9videoHeader->num_ref_pics, 0u);
+        observation_complete_->Set();
+      }
+    }
+  } test;
+
+  RunBaseTest(&test);
+}
+
+TEST_F(VideoSendStreamTest, VP9FlexModeRefs) {
+  class FlexibleMode : public VP9HeaderObeserver {
+    void ModifyConfigsHook(
+        VideoSendStream::Config* send_config,
+        std::vector<VideoReceiveStream::Config>* receive_configs,
+        VideoEncoderConfig* encoder_config) override {
+      vp9_settings_.flexibleMode = true;
+    }
+
+    void InspectHeader(RTPVideoHeaderVP9* vp9videoHeader) override {
+      EXPECT_TRUE(vp9videoHeader->flexible_mode);
+      if (vp9videoHeader->inter_pic_predicted) {
+        EXPECT_GT(vp9videoHeader->num_ref_pics, 0u);
+        observation_complete_->Set();
+      }
+    }
 
   } test;
 
   RunBaseTest(&test);
 }
 
-}  // namespace webrtc
+}  // namespace webrtc