Improve the behavior when the BWE times out and when we have too little data to determine the incom…

webrtc/modules/video_coding/bitrate_adjuster_unittest.cc

 /*
  *  Copyright 2016 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.
  */
 
@@ skipping 68 matching lines @@
   uint32_t last_adjusted_bitrate_bps = 0;
   uint32_t adjusted_bitrate_bps = 0;
 
   SimulateBitrateBps(actual_bitrate_bps);
   VerifyAdjustment();
   last_adjusted_bitrate_bps = adjuster_.GetAdjustedBitrateBps();
 
   SimulateBitrateBps(actual_bitrate_bps);
   VerifyAdjustment();
   adjusted_bitrate_bps = adjuster_.GetAdjustedBitrateBps();
-  EXPECT_LT(adjusted_bitrate_bps, last_adjusted_bitrate_bps);
+  EXPECT_LE(adjusted_bitrate_bps, last_adjusted_bitrate_bps);
   last_adjusted_bitrate_bps = adjusted_bitrate_bps;
   // After two cycles we should've stabilized and hit the lower bound.
   EXPECT_EQ(GetTargetBitrateBpsPct(kMinAdjustedBitratePct),
             adjusted_bitrate_bps);
 
   // Simulate encoder settling down. Adjusted bitrate should increase.
   SimulateBitrateBps(target_bitrate_bps);
   adjusted_bitrate_bps = adjuster_.GetAdjustedBitrateBps();
   VerifyAdjustment();
   EXPECT_GT(adjusted_bitrate_bps, last_adjusted_bitrate_bps);
@@ skipping 59 matching lines @@
   EXPECT_EQ(initial_target_bitrate_bps, adjuster_.GetAdjustedBitrateBps());
 
   // 1.05 * 1.05 is 1.1 which is greater than tolerance for the initial target
   // bitrate. Since we didn't advance the clock the adjuster never updated.
   target_bitrate_bps = (1 + delta_pct) * target_bitrate_bps;
   adjuster_.SetTargetBitrateBps(target_bitrate_bps);
   EXPECT_EQ(target_bitrate_bps, adjuster_.GetAdjustedBitrateBps());
 }
 
 }  // namespace webrtc