Add bug # to GURL pre-native usage trace to help sheriffs.

Bug: 1065377
Change-Id: Id51e30bb496513a30d639fc62537ffd525f10da8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2326450Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Commit-Queue: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793602}

url/android/java/src/org/chromium/url/GURL.java

@@ -84,9 +84,6 @@ public class GURL {
 
     /**
      * Enables debug stack trace gathering for GURL.
-     *
-     * TODO(https://crbug.com/783819): Remove this when the the fraction of users hitting this
-     * drops.
      */
     public static void setReportDebugThrowableCallback(ReportDebugThrowableCallback callback) {
         sReportCallback = callback;
@@ -107,7 +104,8 @@ public class GURL {
             RecordHistogram.recordTimesHistogram("Startup.Android.GURLEnsureMainDexInitialized",
                     SystemClock.elapsedRealtime() - time);
             if (sReportCallback != null && new Random().nextInt(100) < DEBUG_REPORT_PERCENTAGE) {
-                final Throwable throwable = new Throwable("This is not a crash, please ignore.");
+                final Throwable throwable =
+                        new Throwable("This is not a crash, please ignore. See crbug.com/1065377.");
                 // This isn't an assert, because by design this is possible, but we would prefer
                 // this path does not get hit more than necessary and getting stack traces from the
                 // wild will help find issues.