Try re-enabling two PeerConnectionClientTests:

webrtc/examples/androidtests/src/org/appspot/apprtc/test/PeerConnectionClientTest.java

 /*
  *  Copyright 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.
  */
 
 package org.appspot.apprtc.test;
 
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 import android.os.Build;
 import android.support.test.InstrumentationRegistry;
-import android.support.test.filters.FlakyTest;
 import android.support.test.filters.SmallTest;
 import android.util.Log;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import org.appspot.apprtc.AppRTCClient.SignalingParameters;
 import org.appspot.apprtc.PeerConnectionClient;
@@ skipping 557 matching lines @@
       assertTrue("Remote video frames were not rendered after camera switch.",
           remoteRenderer.waitForFramesRendered(WAIT_TIMEOUT));
     }
     pcClient.close();
     assertTrue(waitForPeerConnectionClosed(WAIT_TIMEOUT));
     Log.d(TAG, "testCameraSwitch done.");
   }
 
   // Checks if video source can be restarted - simulate app goes to
   // background and back to foreground.
-  // Disabled because of https://bugs.chromium.org/p/webrtc/issues/detail?id=6478
   @Test
-  @FlakyTest
-  //@SmallTest
+  @SmallTest
   public void testVideoSourceRestart() throws InterruptedException {
     Log.d(TAG, "testVideoSourceRestart");
     loopback = true;
 
     MockRenderer localRenderer = new MockRenderer(EXPECTED_VIDEO_FRAMES, LOCAL_RENDERER_NAME);
     MockRenderer remoteRenderer = new MockRenderer(EXPECTED_VIDEO_FRAMES, REMOTE_RENDERER_NAME);
 
     pcClient = createPeerConnectionClient(localRenderer, remoteRenderer,
         createParametersForVideoCall(VIDEO_CODEC_VP8),
         createCameraCapturer(false /* captureToTexture */), null);
@@ skipping 27 matching lines @@
           localRenderer.waitForFramesRendered(WAIT_TIMEOUT));
       assertTrue("Remote video frames were not rendered after video restart.",
           remoteRenderer.waitForFramesRendered(WAIT_TIMEOUT));
     }
     pcClient.close();
     assertTrue(waitForPeerConnectionClosed(WAIT_TIMEOUT));
     Log.d(TAG, "testVideoSourceRestart done.");
   }
 
   // Checks if capture format can be changed on fly and decoder can be reset properly.
-  // Disabled because of https://bugs.chromium.org/p/webrtc/issues/detail?id=6478
   @Test
-  @FlakyTest
-  //@SmallTest
+  @SmallTest
   public void testCaptureFormatChange() throws InterruptedException {
     Log.d(TAG, "testCaptureFormatChange");
     loopback = true;
 
     MockRenderer localRenderer = new MockRenderer(EXPECTED_VIDEO_FRAMES, LOCAL_RENDERER_NAME);
     MockRenderer remoteRenderer = new MockRenderer(EXPECTED_VIDEO_FRAMES, REMOTE_RENDERER_NAME);
 
     pcClient = createPeerConnectionClient(localRenderer, remoteRenderer,
         createParametersForVideoCall(VIDEO_CODEC_VP8),
         createCameraCapturer(false /* captureToTexture */), null);
@@ skipping 29 matching lines @@
           localRenderer.waitForFramesRendered(WAIT_TIMEOUT));
       assertTrue("Remote video frames were not rendered after capture format change.",
           remoteRenderer.waitForFramesRendered(WAIT_TIMEOUT));
     }
 
     pcClient.close();
     assertTrue(waitForPeerConnectionClosed(WAIT_TIMEOUT));
     Log.d(TAG, "testCaptureFormatChange done.");
   }
 }