Let ViEEncoder handle resolution changes.

webrtc/test/encoder_settings.h

 /*
  *  Copyright (c) 2014 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.
  */
 #ifndef WEBRTC_TEST_ENCODER_SETTINGS_H_
 #define WEBRTC_TEST_ENCODER_SETTINGS_H_
 
+#include <vector>
+
 #include "webrtc/video_receive_stream.h"
 #include "webrtc/video_send_stream.h"
 
 namespace webrtc {
 namespace test {
-std::vector<VideoStream> CreateVideoStreams(size_t num_streams);
+
+class DefaultVideoStreamFactory
+    : public VideoEncoderConfig::VideoStreamFactoryInterface {
+ public:
+  DefaultVideoStreamFactory();
+
+  static const size_t kMaxNumberOfStreams = 3;
+  // Defined as {150000, 450000, 1500000};
+  static const int kMaxBitratePerStream[];
+  // Defined as {50000, 200000, 700000};
+  static const int kDefaultMinBitratePerStream[];
+
+ private:
+  std::vector<VideoStream> CreateEncoderStreams(
+      int width,
+      int height,
+      const VideoEncoderConfig& encoder_config) override;
+};
+
+// Creates |encoder_config.number_of_streams| VideoStreams where index
+// |encoder_config.number_of_streams -1| have width = |width|, height =
+// |height|. The total max bitrate of all VideoStreams is
+// |encoder_config.max_bitrate_bps|.
+std::vector<VideoStream> CreateVideoStreams(
+    int width,
+    int height,
+    const webrtc::VideoEncoderConfig& encoder_config);
+
+void FillEncoderConfiguration(size_t num_streams,
+                              VideoEncoderConfig* configuration);
 
 VideoReceiveStream::Decoder CreateMatchingDecoder(
     const VideoSendStream::Config::EncoderSettings& encoder_settings);
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_ENCODER_SETTINGS_H_