Add Cast PLI support on sender side.

media/cast/test/end2end_unittest.cc

Index: media/cast/test/end2end_unittest.cc
diff --git a/media/cast/test/end2end_unittest.cc b/media/cast/test/end2end_unittest.cc
index 7145ba369a3a9868427ce91042aa783e3da2f062..bd5b49ec63fbb97d6616fd81c43f7c74e494a96c 100644
--- a/media/cast/test/end2end_unittest.cc
+++ b/media/cast/test/end2end_unittest.cc
@@ -1275,5 +1275,45 @@ TEST_F(End2EndTest, TestSetPlayoutDelay) {
   EXPECT_LT(jump, 120u);
 }
 
+namespace {
+
+void OnEncodedVideoFrame(scoped_ptr<EncodedFrame> encoded_frame) {
+  const uint32_t frame_id = encoded_frame->frame_id;
+  if ((frame_id == 0) || (frame_id == 3))
+    EXPECT_EQ(encoded_frame->dependency, EncodedFrame::KEY);
+  else
+    EXPECT_EQ(encoded_frame->dependency, EncodedFrame::DEPENDENT);
+}
+
+}  // namespace
+
+TEST_F(End2EndTest, TestPliGeneratingKeyFrames) {
+  Configure(CODEC_VIDEO_VP8, CODEC_AUDIO_PCM16);
+  Create();
+
+  // Enqueue request of 4 frames from the encoder.
+  for (int i = 0; i < 4; ++i) {
+    cast_receiver_->RequestEncodedVideoFrame(base::Bind(&OnEncodedVideoFrame));
+  }
+
+  // Encode 3 frames.
+  for (int frame_id = 0; frame_id < 3; ++frame_id) {
+    SendVideoFrame(frame_id, testing_clock_.NowTicks());
+    RunTasks(33);
+  }
+
+  // Send Pli from receiver.
+  RtcpCastMessage cast_message_(video_sender_config_.ssrc);
+  cast_message_.picture_loss_indicator = true;
+  transport_receiver_->SendRtcpFromRtpReceiver(
+      video_sender_config_.receiver_ssrc, video_sender_config_.ssrc,
+      media::cast::RtcpTimeData(), &cast_message_, base::TimeDelta(), nullptr,
+      nullptr);
+  // Encode the 4th frame.
+  SendVideoFrame(
+      3, testing_clock_.NowTicks() + base::TimeDelta::FromMilliseconds(500));
+  RunTasks(33);
+}
+
 }  // namespace cast
 }  // namespace media