Fix race in WebRtcVideoEngine2Tests, improve coverage.

webrtc/media/engine/fakewebrtcvideoengine.h

 /*
  *  Copyright (c) 2010 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 181 matching lines @@
     encoders_.push_back(encoder);
     num_created_encoders_++;
     created_video_encoder_event_.Set();
     return encoder;
   }
 
   bool WaitForCreatedVideoEncoders(int num_encoders) {
     int64_t start_offset_ms = rtc::TimeMillis();
     int64_t wait_time = kEventTimeoutMs;
     do {
-      if (GetNumCreatedEncoders() >= num_encoders)
+      int num_created_encoders = GetNumCreatedEncoders();
+      if (num_created_encoders == num_encoders) {
         return true;
+      } else if (num_created_encoders > num_encoders) {
+        return false;
+      }
       wait_time = kEventTimeoutMs - (rtc::TimeMillis() - start_offset_ms);
     } while (wait_time > 0 && created_video_encoder_event_.Wait(wait_time));
     return false;
   }
 
   void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) override {
     rtc::CritScope lock(&crit_);
     encoders_.erase(
         std::remove(encoders_.begin(), encoders_.end(), encoder),
         encoders_.end());
@@ skipping 40 matching lines @@
   rtc::Event created_video_encoder_event_;
   std::vector<cricket::VideoCodec> codecs_;
   std::vector<FakeWebRtcVideoEncoder*> encoders_ GUARDED_BY(crit_);
   int num_created_encoders_ GUARDED_BY(crit_);
   bool encoders_have_internal_sources_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_FAKEWEBRTCVIDEOENGINE_H_