Use DecimalFormat instead of String.format.

Speculative fix to a problem where String.format crashes with
"java.lang.NullPointerException at Formatter$FormatSpecifier.addZeros :
Attempt to get length of null array" on some devices.

Bug: b/80240768
Change-Id: I8e67b7107a37ad7d6f978b9de368f14d37efecb2
Reviewed-on: https://webrtc-review.googlesource.com/80883
Reviewed-by: Magnus Jedvert <magjed@webrtc.org>
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23523}

sdk/android/api/org/webrtc/EglRenderer.java

@@ -19,9 +19,9 @@ import android.os.HandlerThread;
 import android.os.Looper;
 import android.view.Surface;
 import java.nio.ByteBuffer;
+import java.text.DecimalFormat;
 import java.util.ArrayList;
 import java.util.Iterator;
-import java.util.Locale;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import javax.annotation.Nullable;
@@ -665,6 +665,7 @@ public class EglRenderer implements VideoRenderer.Callbacks, VideoSink {
   }
 
   private void logStatistics() {
+    final DecimalFormat fpsFormat = new DecimalFormat("#.0");
     final long currentTimeNs = System.nanoTime();
     synchronized (statisticsLock) {
       final long elapsedTimeNs = currentTimeNs - statisticsStartTimeNs;
@@ -676,7 +677,7 @@ public class EglRenderer implements VideoRenderer.Callbacks, VideoSink {
           + " Frames received: " + framesReceived + "."
           + " Dropped: " + framesDropped + "."
           + " Rendered: " + framesRendered + "."
-          + " Render fps: " + String.format(Locale.US, "%.1f", renderFps) + "."
+          + " Render fps: " + fpsFormat.format(renderFps) + "."
           + " Average render time: " + averageTimeAsString(renderTimeNs, framesRendered) + "."
           + " Average swapBuffer time: "
           + averageTimeAsString(renderSwapBufferTimeNs, framesRendered) + ".");