API changes to Write path Session on down for FEC protection.

net/quic/quic_packet_generator_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_packet_generator.h"
 
 #include <string>
 
 #include "net/quic/crypto/crypto_protocol.h"
 #include "net/quic/crypto/null_encrypter.h"
 #include "net/quic/crypto/quic_decrypter.h"
 #include "net/quic/crypto/quic_encrypter.h"
 #include "net/quic/quic_utils.h"
 #include "net/quic/test_tools/quic_packet_creator_peer.h"
-#include "net/quic/test_tools/quic_packet_generator_peer.h"
 #include "net/quic/test_tools/quic_test_utils.h"
 #include "net/quic/test_tools/simple_quic_framer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::StringPiece;
 using std::string;
 using testing::InSequence;
 using testing::Return;
 using testing::SaveArg;
@@ skipping 343 matching lines @@
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   PacketContents contents;
   contents.num_rst_stream_frames = 1;
   CheckPacketContains(contents, packet_);
 }
 
 TEST_F(QuicPacketGeneratorTest, ConsumeData_NotWritable) {
   delegate_.SetCanNotWrite();
 
-  QuicConsumedData consumed = generator_.ConsumeData(1, MakeIOVector("foo"), 2,
-                                                     true, NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      1, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(0u, consumed.bytes_consumed);
   EXPECT_FALSE(consumed.fin_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
 }
 
 TEST_F(QuicPacketGeneratorTest, ConsumeData_WritableAndShouldNotFlush) {
   delegate_.SetCanWriteAnything();
   generator_.StartBatchOperations();
 
-  QuicConsumedData consumed = generator_.ConsumeData(1, MakeIOVector("foo"), 2,
-                                                     true, NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      1, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(3u, consumed.bytes_consumed);
   EXPECT_TRUE(consumed.fin_consumed);
   EXPECT_TRUE(generator_.HasQueuedFrames());
 }
 
 TEST_F(QuicPacketGeneratorTest, ConsumeData_WritableAndShouldFlush) {
   delegate_.SetCanWriteAnything();
 
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
-  QuicConsumedData consumed = generator_.ConsumeData(1, MakeIOVector("foo"), 2,
-                                                     true, NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      1, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(3u, consumed.bytes_consumed);
   EXPECT_TRUE(consumed.fin_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   PacketContents contents;
   contents.num_stream_frames = 1;
   CheckPacketContains(contents, packet_);
 }
 
 TEST_F(QuicPacketGeneratorTest,
        ConsumeDataMultipleTimes_WritableAndShouldNotFlush) {
   delegate_.SetCanWriteAnything();
   generator_.StartBatchOperations();
 
-  generator_.ConsumeData(1, MakeIOVector("foo"), 2, true, NULL);
-  QuicConsumedData consumed = generator_.ConsumeData(3, MakeIOVector("quux"), 7,
-                                                     false, NULL);
+  generator_.ConsumeData(1, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT,
+                         NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      3, MakeIOVector("quux"), 7, false, MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(4u, consumed.bytes_consumed);
   EXPECT_FALSE(consumed.fin_consumed);
   EXPECT_TRUE(generator_.HasQueuedFrames());
 }
 
 TEST_F(QuicPacketGeneratorTest, ConsumeData_BatchOperations) {
   delegate_.SetCanWriteAnything();
   generator_.StartBatchOperations();
 
-  generator_.ConsumeData(1, MakeIOVector("foo"), 2, true, NULL);
-  QuicConsumedData consumed = generator_.ConsumeData(3, MakeIOVector("quux"), 7,
-                                                     false, NULL);
+  generator_.ConsumeData(1, MakeIOVector("foo"), 2, true, MAY_FEC_PROTECT,
+                         NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      3, MakeIOVector("quux"), 7, false, MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(4u, consumed.bytes_consumed);
   EXPECT_FALSE(consumed.fin_consumed);
   EXPECT_TRUE(generator_.HasQueuedFrames());
 
   // Now both frames will be flushed out.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
   generator_.FinishBatchOperations();
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   PacketContents contents;
   contents.num_stream_frames = 2;
   CheckPacketContains(contents, packet_);
 }
 
 TEST_F(QuicPacketGeneratorTest, ConsumeDataFEC) {
   delegate_.SetCanWriteAnything();
 
   // Send FEC every two packets.
   creator_.set_max_packets_per_fec_group(2);
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
 
   {
     InSequence dummy;
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet2_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet3_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet4_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet5_), Return(true)));
   }
 
-  // Send enough data to create 3 packets: two full and one partial.
+  // Send enough data to create 3 packets: two full and one partial. Send
+  // with MUST_FEC_PROTECT flag.
   size_t data_len = 2 * kDefaultMaxPacketSize + 100;
   QuicConsumedData consumed =
-      generator_.ConsumeData(3, CreateData(data_len), 0, true, NULL);
+      generator_.ConsumeData(3, CreateData(data_len), 0, true,
+                             MUST_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   EXPECT_TRUE(consumed.fin_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   CheckPacketHasSingleStreamFrame(packet_);
   CheckPacketHasSingleStreamFrame(packet2_);
   CheckPacketIsFec(packet3_, 1);
 
   CheckPacketHasSingleStreamFrame(packet4_);
   CheckPacketIsFec(packet5_, 4);
 }
 
 TEST_F(QuicPacketGeneratorTest, ConsumeDataSendsFecAtEnd) {
   delegate_.SetCanWriteAnything();
 
-  // Send FEC every six packets.
+  // Enable FEC.
   creator_.set_max_packets_per_fec_group(6);
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
   {
     InSequence dummy;
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet2_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet3_), Return(true)));
   }
 
-  // Send enough data to create 2 packets: one full and one partial.
+  // Send enough data to create 2 packets: one full and one partial. Send
+  // with MUST_FEC_PROTECT flag.
   size_t data_len = 1 * kDefaultMaxPacketSize + 100;
   QuicConsumedData consumed =
-      generator_.ConsumeData(3, CreateData(data_len), 0, true, NULL);
+      generator_.ConsumeData(3, CreateData(data_len), 0, true,
+                             MUST_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   EXPECT_TRUE(consumed.fin_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   CheckPacketHasSingleStreamFrame(packet_);
   CheckPacketHasSingleStreamFrame(packet2_);
   CheckPacketIsFec(packet3_, 1);
 }
 
 TEST_F(QuicPacketGeneratorTest, ConsumeData_FramesPreviouslyQueued) {
@@ skipping 16 matching lines @@
   {
      InSequence dummy;
      EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
          DoAll(SaveArg<0>(&packet_), Return(true)));
      EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
          DoAll(SaveArg<0>(&packet2_), Return(true)));
   }
   generator_.StartBatchOperations();
   // Queue enough data to prevent a stream frame with a non-zero offset from
   // fitting.
-  QuicConsumedData consumed = generator_.ConsumeData(1, MakeIOVector("foo"), 0,
-                                                     false, NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      1, MakeIOVector("foo"), 0, false, MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(3u, consumed.bytes_consumed);
   EXPECT_FALSE(consumed.fin_consumed);
   EXPECT_TRUE(generator_.HasQueuedFrames());
 
   // This frame will not fit with the existing frame, causing the queued frame
   // to be serialized, and it will not fit with another frame like it, so it is
   // serialized by itself.
-  consumed = generator_.ConsumeData(1, MakeIOVector("bar"), 3, true, NULL);
+  consumed = generator_.ConsumeData(1, MakeIOVector("bar"), 3, true,
+                                    MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(3u, consumed.bytes_consumed);
   EXPECT_TRUE(consumed.fin_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   PacketContents contents;
   contents.num_stream_frames = 1;
   CheckPacketContains(contents, packet_);
   CheckPacketContains(contents, packet2_);
 }
 
 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOff) {
   delegate_.SetCanWriteAnything();
   // Enable FEC.
   creator_.set_max_packets_per_fec_group(2);
   EXPECT_FALSE(creator_.IsFecProtected());
 
   // Send one unprotected data packet.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet_), Return(true)));
   QuicConsumedData consumed =
-      generator_.ConsumeData(5, CreateData(1u), 0, true, NULL);
+      generator_.ConsumeData(5, CreateData(1u), 0, true, MAY_FEC_PROTECT,
+                             NULL);
   EXPECT_EQ(1u, consumed.bytes_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
   EXPECT_FALSE(creator_.IsFecProtected());
   // Verify that one data packet was sent.
   PacketContents contents;
   contents.num_stream_frames = 1;
   CheckPacketContains(contents, packet_);
 
-  // Turn on FEC protection.
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
-  EXPECT_TRUE(creator_.IsFecProtected());
   {
     InSequence dummy;
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet2_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet3_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet4_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet5_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet6_), Return(true)));
   }
-  // Send enough data to create 3 packets.
+  // Send enough data to create 3 packets with MUST_FEC_PROTECT flag.
   size_t data_len = 2 * kDefaultMaxPacketSize + 100;
-  consumed = generator_.ConsumeData(7, CreateData(data_len), 0, true, NULL);
+  consumed = generator_.ConsumeData(7, CreateData(data_len), 0, true,
+                                    MUST_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
-  EXPECT_TRUE(creator_.IsFecProtected());
 
   // Verify that two FEC packets were sent.
   CheckPacketHasSingleStreamFrame(packet2_);
   CheckPacketHasSingleStreamFrame(packet3_);
   CheckPacketIsFec(packet4_, /*fec_group=*/2u);
   CheckPacketHasSingleStreamFrame(packet5_);
   CheckPacketIsFec(packet6_, /*fec_group=*/5u);  // Sent at the end of stream.
 
-  // Turn off FEC protection and send one unprotected data packet.
-  QuicPacketGeneratorPeer::MaybeStopFecProtection(&generator_, false);
+  // Send one unprotected data packet.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet7_), Return(true)));
-  consumed = generator_.ConsumeData(7, CreateData(1u), 0, true, NULL);
+  consumed = generator_.ConsumeData(7, CreateData(1u), 0, true,
+                                    MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(1u, consumed.bytes_consumed);
   EXPECT_FALSE(generator_.HasQueuedFrames());
   EXPECT_FALSE(creator_.IsFecProtected());
   // Verify that one unprotected data packet was sent.
   CheckPacketContains(contents, packet7_);
 }
 
 TEST_F(QuicPacketGeneratorTest, SwitchFecOnWithPendingFrameInCreator) {
   delegate_.SetCanWriteAnything();
   // Enable FEC.
   creator_.set_max_packets_per_fec_group(2);
 
   generator_.StartBatchOperations();
   // Queue enough data to prevent a stream frame with a non-zero offset from
   // fitting.
-  QuicConsumedData consumed = generator_.ConsumeData(7, CreateData(1u), 0,
-                                                     true, NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      7, CreateData(1u), 0, true, MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(1u, consumed.bytes_consumed);
   EXPECT_TRUE(creator_.HasPendingFrames());
 
-  // Turn on FEC protection. Should cause queued frames to be flushed.
+  // Queue protected data for sending. Should cause queued frames to be flushed.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
   EXPECT_FALSE(creator_.IsFecProtected());
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
-  CheckPacketHasSingleStreamFrame(packet_);
+  consumed = generator_.ConsumeData(7, CreateData(1u), 0, true,
+                                    MUST_FEC_PROTECT, NULL);
+  EXPECT_EQ(1u, consumed.bytes_consumed);
+  PacketContents contents;
+  contents.num_stream_frames = 1;
+  // Transmitted packet was not FEC protected.
+  CheckPacketContains(contents, packet_);
   EXPECT_TRUE(creator_.IsFecProtected());
+  EXPECT_TRUE(creator_.HasPendingFrames());
 }
 
 TEST_F(QuicPacketGeneratorTest, SwitchFecOnWithPendingFramesInGenerator) {
   // Enable FEC.
   creator_.set_max_packets_per_fec_group(2);
 
   // Queue control frames in generator.
   delegate_.SetCanNotWrite();
   generator_.SetShouldSendAck(true, true);
   delegate_.SetCanWriteAnything();
+  generator_.StartBatchOperations();
 
   // Set up frames to write into the creator when control frames are written.
   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
   EXPECT_CALL(delegate_, CreateFeedbackFrame()).WillOnce(
       Return(CreateFeedbackFrame()));
   EXPECT_CALL(delegate_, CreateStopWaitingFrame()).WillOnce(
       Return(CreateStopWaitingFrame()));
 
   // Generator should have queued control frames, and creator should be empty.
   EXPECT_TRUE(generator_.HasQueuedFrames());
   EXPECT_FALSE(creator_.HasPendingFrames());
   EXPECT_FALSE(creator_.IsFecProtected());
 
-  // Turn on FEC protection. Should cause queued control frames to be flushed.
+  // Queue protected data for sending. Should cause queued frames to be flushed.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
+  QuicConsumedData consumed = generator_.ConsumeData(7, CreateData(1u), 0, true,
+                                                     MUST_FEC_PROTECT, NULL);
+  EXPECT_EQ(1u, consumed.bytes_consumed);
   PacketContents contents;
   contents.num_ack_frames = 1;
   contents.num_feedback_frames = 1;
   contents.num_stop_waiting_frames = 1;
   CheckPacketContains(contents, packet_);
 
   // FEC protection should be on in creator.
   EXPECT_TRUE(creator_.IsFecProtected());
 }
 
 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOffWithSubsequentFramesProtected) {
   delegate_.SetCanWriteAnything();
 
-  // Enable and start FEC protection.
+  // Enable FEC.
   creator_.set_max_packets_per_fec_group(2);
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
-  EXPECT_TRUE(creator_.IsFecProtected());
+  EXPECT_FALSE(creator_.IsFecProtected());
 
   // Queue stream frame to be protected in creator.
   generator_.StartBatchOperations();
   QuicConsumedData consumed = generator_.ConsumeData(5, CreateData(1u), 0, true,
-                                                     NULL);
+                                                     MUST_FEC_PROTECT, NULL);
   EXPECT_EQ(1u, consumed.bytes_consumed);
-  // Turn FEC protection off in generator.
-  QuicPacketGeneratorPeer::MaybeStopFecProtection(&generator_, /*force=*/false);
   // Creator has a pending protected frame.
   EXPECT_TRUE(creator_.HasPendingFrames());
   EXPECT_TRUE(creator_.IsFecProtected());
 
-  // Add enough data to exceed size of current packet, so that current packet
-  // is sent. Both frames will be sent out in a single packet.
+  // Add enough unprotected data to exceed size of current packet, so that
+  // current packet is sent. Both frames will be sent out in a single packet.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
   size_t data_len = kDefaultMaxPacketSize;
-  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true, NULL);
+  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
+                                    MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   PacketContents contents;
   contents.num_stream_frames = 2u;
   contents.fec_group = 1u;
   CheckPacketContains(contents, packet_);
   // FEC protection should still be on in creator.
   EXPECT_TRUE(creator_.IsFecProtected());
 }
 
 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOffWithSubsequentPacketsProtected) {
   delegate_.SetCanWriteAnything();
 
-  // Enable and start FEC protection.
+  // Enable FEC.
   creator_.set_max_packets_per_fec_group(2);
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
-  EXPECT_TRUE(creator_.IsFecProtected());
+  EXPECT_FALSE(creator_.IsFecProtected());
 
   generator_.StartBatchOperations();
   // Send first packet, FEC protected.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
   // Write enough data to cause a packet to be emitted.
   size_t data_len = kDefaultMaxPacketSize;
-  QuicConsumedData consumed = generator_.ConsumeData(5, CreateData(data_len),
-                                                     0, true, NULL);
+  QuicConsumedData consumed = generator_.ConsumeData(
+      5, CreateData(data_len), 0, true, MUST_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   PacketContents contents;
   contents.num_stream_frames = 1u;
   contents.fec_group = 1u;
   CheckPacketContains(contents, packet_);
 
-  // Turn FEC protection off in generator.
-  QuicPacketGeneratorPeer::MaybeStopFecProtection(&generator_, /*force=*/false);
-  // FEC group is still open in creator.
+  // FEC should still be on in creator.
   EXPECT_TRUE(creator_.IsFecProtected());
 
-  // Send second packet, which is protected because it happens to fall within an
-  // open FEC group. Data packet will be followed by FEC packet.
+  // Send enough unprotected data to cause second packet to be sent, which gets
+  // protected because it happens to fall within an open FEC group. Data packet
+  // will be followed by FEC packet.
   {
     InSequence dummy;
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet2_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet3_), Return(true)));
   }
-  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true, NULL);
+  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
+                                    MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   contents.num_stream_frames = 2u;
   CheckPacketContains(contents, packet2_);
   CheckPacketIsFec(packet3_, /*fec_group=*/1u);
 
   // FEC protection should be off in creator.
   EXPECT_FALSE(creator_.IsFecProtected());
 }
 
 TEST_F(QuicPacketGeneratorTest, SwitchFecOnOffThenOnWithCreatorProtectionOn) {
   delegate_.SetCanWriteAnything();
   generator_.StartBatchOperations();
 
-  // Enable and start FEC protection.
+  // Enable FEC.
   creator_.set_max_packets_per_fec_group(2);
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
-  EXPECT_TRUE(creator_.IsFecProtected());
+  EXPECT_FALSE(creator_.IsFecProtected());
 
-  // Queue one byte of FEC protected data and turn FEC off in generator.
+  // Queue one byte of FEC protected data.
   QuicConsumedData consumed = generator_.ConsumeData(5, CreateData(1u), 0, true,
-                                                     NULL);
-  QuicPacketGeneratorPeer::MaybeStopFecProtection(&generator_, /*force=*/false);
+                                                     MUST_FEC_PROTECT, NULL);
   EXPECT_TRUE(creator_.HasPendingFrames());
 
-  // Add more data causing first packet to be sent, FEC protected.
+  // Add more unprotected data causing first packet to be sent, FEC protected.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
-  // Write enough data to cause a packet to be emitted.
   size_t data_len = kDefaultMaxPacketSize;
-  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true, NULL);
+  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
+                                    MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   PacketContents contents;
   contents.num_stream_frames = 2u;
   contents.fec_group = 1u;
   CheckPacketContains(contents, packet_);
 
   // FEC group is still open in creator.
   EXPECT_TRUE(creator_.IsFecProtected());
-  // Turn FEC on again in generator, for the next data.
-  QuicPacketGeneratorPeer::MaybeStartFecProtection(&generator_);
-
   // Add data that should be protected, large enough to cause second packet to
   // be sent. Data packet should be followed by FEC packet.
   {
     InSequence dummy;
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet2_), Return(true)));
     EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
         DoAll(SaveArg<0>(&packet3_), Return(true)));
   }
-  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true, NULL);
+  consumed = generator_.ConsumeData(5, CreateData(data_len), 0, true,
+                                    MUST_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   CheckPacketContains(contents, packet2_);
   CheckPacketIsFec(packet3_, /*fec_group=*/1u);
 
-  // FEC protection should be on in creator.
+  // FEC protection should remain on in creator.
   EXPECT_TRUE(creator_.IsFecProtected());
 }
 
 TEST_F(QuicPacketGeneratorTest, NotWritableThenBatchOperations) {
   delegate_.SetCanNotWrite();
 
   generator_.SetShouldSendAck(true, false);
   generator_.AddControlFrame(QuicFrame(CreateRstStreamFrame()));
   EXPECT_TRUE(generator_.HasQueuedFrames());
 
   delegate_.SetCanWriteAnything();
 
   generator_.StartBatchOperations();
 
   // When the first write operation is invoked, the ack and feedback
   // frames will be returned.
   EXPECT_CALL(delegate_, CreateAckFrame()).WillOnce(Return(CreateAckFrame()));
   EXPECT_CALL(delegate_, CreateFeedbackFrame()).WillOnce(
       Return(CreateFeedbackFrame()));
 
   // Send some data and a control frame
-  generator_.ConsumeData(3, MakeIOVector("quux"), 7, false, NULL);
+  generator_.ConsumeData(3, MakeIOVector("quux"), 7, false,
+                         MAY_FEC_PROTECT, NULL);
   generator_.AddControlFrame(QuicFrame(CreateGoAwayFrame()));
 
   // All five frames will be flushed out in a single packet.
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
   generator_.FinishBatchOperations();
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   PacketContents contents;
   contents.num_ack_frames = 1;
@@ skipping 26 matching lines @@
   // All five frames will be flushed out in a single packet
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet_), Return(true)));
   EXPECT_CALL(delegate_, OnSerializedPacket(_)).WillOnce(
       DoAll(SaveArg<0>(&packet2_), Return(true)));
   }
 
   // Send enough data to exceed one packet
   size_t data_len = kDefaultMaxPacketSize + 100;
   QuicConsumedData consumed =
-      generator_.ConsumeData(3, CreateData(data_len), 0, true, NULL);
+      generator_.ConsumeData(3, CreateData(data_len), 0, true,
+                             MAY_FEC_PROTECT, NULL);
   EXPECT_EQ(data_len, consumed.bytes_consumed);
   EXPECT_TRUE(consumed.fin_consumed);
   generator_.AddControlFrame(QuicFrame(CreateGoAwayFrame()));
 
   generator_.FinishBatchOperations();
   EXPECT_FALSE(generator_.HasQueuedFrames());
 
   // The first packet should have the queued data and part of the stream data.
   PacketContents contents;
   contents.num_ack_frames = 1;
   contents.num_feedback_frames = 1;
   contents.num_rst_stream_frames = 1;
   contents.num_stream_frames = 1;
   CheckPacketContains(contents, packet_);
 
   // The second should have the remainder of the stream data.
   PacketContents contents2;
   contents2.num_goaway_frames = 1;
   contents2.num_stream_frames = 1;
   CheckPacketContains(contents2, packet2_);
 }
 
 }  // namespace test
 }  // namespace net