Add sms export library and sample app.

app/src/main/java/org/thoughtcrime/securesms/util/AppStartup.java

@@ -7,6 +7,7 @@ import android.os.Looper;
 import androidx.annotation.MainThread;
 import androidx.annotation.NonNull;
 
+import org.signal.core.util.Stopwatch;
 import org.signal.core.util.concurrent.SignalExecutors;
 import org.signal.core.util.logging.Log;
 

app/src/main/java/org/thoughtcrime/securesms/util/Stopwatch.java

@@ -1,58 +0,0 @@
-package org.thoughtcrime.securesms.util;
-
-import androidx.annotation.NonNull;
-
-import org.signal.core.util.logging.Log;
-
-import java.util.LinkedList;
-import java.util.List;
-
-public class Stopwatch {
-
-  private final long        startTime;
-  private final String      title;
-  private final List<Split> splits;
-
-  public Stopwatch(@NonNull String title) {
-    this.startTime = System.currentTimeMillis();
-    this.title     = title;
-    this.splits    = new LinkedList<>();
-  }
-
-  public void split(@NonNull String label) {
-    splits.add(new Split(System.currentTimeMillis(), label));
-  }
-
-  public void stop(@NonNull String tag) {
-    StringBuilder out = new StringBuilder();
-    out.append("[").append(title).append("] ");
-
-    if (splits.size() > 0) {
-      out.append(splits.get(0).label).append(": ");
-      out.append(splits.get(0).time - startTime);
-      out.append("  ");
-    }
-
-    if (splits.size() > 1) {
-      for (int i = 1; i < splits.size(); i++) {
-        out.append(splits.get(i).label).append(": ");
-        out.append(splits.get(i).time - splits.get(i - 1).time);
-        out.append("  ");
-      }
-
-      out.append("total: ").append(splits.get(splits.size() - 1).time - startTime);
-    }
-
-    Log.d(tag, out.toString());
-  }
-
-  private static class Split {
-    final long   time;
-    final String label;
-
-    Split(long time, String label) {
-      this.time  = time;
-      this.label = label;
-    }
-  }
-}