Make RttTextStream's read interruptible

Wrap the FileInputStream in a java.nio.Channel so that sending a
Thread.interrupt() to the thread blocked on the read will actually do
something.

Change-Id: Icc11ba69167f448e2b33d9a1a13a1dfa5e5d0d58
Fixes: 110570772
Test: manual (follow repro steps in bug, but type really fast),treehugger

telecomm/java/android/telecom/Connection.java

@@ -45,6 +45,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.OutputStreamWriter;
+import java.nio.channels.Channels;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -861,8 +862,11 @@ public abstract class Connection extends Conferenceable {
         public RttTextStream(ParcelFileDescriptor toInCall, ParcelFileDescriptor fromInCall) {
             mFdFromInCall = fromInCall;
             mFdToInCall = toInCall;
+
+            // Wrap the FileInputStream in a Channel so that it's interruptible.
             mPipeFromInCall = new InputStreamReader(
-                    new FileInputStream(fromInCall.getFileDescriptor()));
+                    Channels.newInputStream(Channels.newChannel(
+                            new FileInputStream(fromInCall.getFileDescriptor()))));
             mPipeToInCall = new OutputStreamWriter(
                     new FileOutputStream(toInCall.getFileDescriptor()));
         }