Fix issue where video scaling gets stuck at low resolution

webrtc/media/base/videoadapter_unittest.cc

 /*
  *  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 998 matching lines @@
   adapter_.OnResolutionRequest(rtc::Optional<int>(),
                                rtc::Optional<int>(640 * 480 - 1));
 
   // Still expect all frames to be dropped
   EXPECT_FALSE(adapter_.AdaptFrameResolution(
       capture_format_.width, capture_format_.height, 0,
       &cropped_width_, &cropped_height_,
       &out_width_, &out_height_));
 }
 
+// Test that we will adapt to max given a target pixel count close to max.
+TEST_F(VideoAdapterTest, TestAdaptToMax) {
+  adapter_.OnOutputFormatRequest(VideoFormat(640, 360, 0, FOURCC_I420));
+  adapter_.OnResolutionRequest(rtc::Optional<int>(640 * 360 - 1) /* target */,
+                               rtc::Optional<int>());
+
+  EXPECT_TRUE(adapter_.AdaptFrameResolution(640, 360, 0, &cropped_width_,
+                                            &cropped_height_, &out_width_,
+                                            &out_height_));
+  EXPECT_EQ(640, out_width_);
+  EXPECT_EQ(360, out_height_);
+}
+
 }  // namespace cricket