Set min BWE bitrate form 10kbps to 5kbps and centralize minimum bitrate.

webrtc/modules/bitrate_controller/bitrate_controller_unittest.cc

 /*
  *  Copyright (c) 2012 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
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <algorithm>
 #include <vector>
 
 #include "webrtc/call/mock/mock_rtc_event_log.h"
 #include "webrtc/modules/bitrate_controller/include/bitrate_controller.h"
 #include "webrtc/modules/pacing/mock/mock_paced_sender.h"
+#include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
 #include "webrtc/test/field_trial.h"
 #include "webrtc/test/gtest.h"
 
 using ::testing::Exactly;
 using ::testing::Return;
 
 using webrtc::BitrateController;
 using webrtc::BitrateObserver;
 using webrtc::PacedSender;
@@ skipping 64 matching lines @@
   std::unique_ptr<BitrateController> controller_;
   std::unique_ptr<RtcpBandwidthObserver> bandwidth_observer_;
   testing::NiceMock<webrtc::MockRtcEventLog> event_log_;
 };
 
 TEST_F(BitrateControllerTest, DefaultMinMaxBitrate) {
   // Receive successively lower REMBs, verify the reserved bitrate is deducted.
   controller_->SetMinMaxBitrate(0, 0);
   EXPECT_EQ(kStartBitrateBps, bitrate_observer_.last_bitrate_);
   bandwidth_observer_->OnReceivedEstimatedBitrate(kDefaultMinBitrateBps / 2);
-  EXPECT_EQ(kDefaultMinBitrateBps, bitrate_observer_.last_bitrate_);
+  EXPECT_EQ(webrtc::remote_bitrate_estimator_defines::kMinBitrateBps,
+            bitrate_observer_.last_bitrate_);
   bandwidth_observer_->OnReceivedEstimatedBitrate(2 * kDefaultMaxBitrateBps);
   clock_.AdvanceTimeMilliseconds(1000);
   controller_->Process();
   EXPECT_EQ(kDefaultMaxBitrateBps, bitrate_observer_.last_bitrate_);
 }
 
 TEST_F(BitrateControllerTest, OneBitrateObserverOneRtcpObserver) {
   // First REMB applies immediately.
   int64_t time_ms = 1001;
   webrtc::ReportBlockList report_blocks;
@@ skipping 393 matching lines @@
   clock_.AdvanceTimeMilliseconds(100);
 
   // 15 packets reported as received since last, enough to increase.
   report_blocks.push_back(CreateReportBlock(1, 2, 0, 41));
   bandwidth_observer_->OnReceivedRtcpReceiverReport(
       report_blocks, 50, clock_.TimeInMilliseconds());
   expected_bitrate_bps = expected_bitrate_bps * 1.08 + 1000;
   EXPECT_EQ(expected_bitrate_bps, bitrate_observer_.last_bitrate_);
   clock_.AdvanceTimeMilliseconds(1000);
 }