Added option to specify a maximum file size when recording an AEC dump.

For applications with a strict filesize limit for debug files,
I added an option to specify a maximum filesize for AEC dumps. An
existing unit test is extended to check that the feature works as
advertised.

BUG=webrtc:4741
TBR=glaznev@webrtc.org

Review URL: https://codereview.webrtc.org/1413483003

Cr-Commit-Position: refs/heads/master@{#11081}

webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java

@@ -496,7 +496,7 @@ public class PeerConnectionClient {
                 ParcelFileDescriptor.MODE_READ_WRITE |
                 ParcelFileDescriptor.MODE_CREATE |
                 ParcelFileDescriptor.MODE_TRUNCATE);
-        factory.startAecDump(aecDumpFileDescriptor.getFd());
+        factory.startAecDump(aecDumpFileDescriptor.getFd(), -1);
       } catch(IOException e) {
         Log.e(TAG, "Can not open aecdump file", e);
       }