Bug 1696460 - Improve bind error logging. r=aklotz

This error is sent to the native layer so we never log it (at least locally).

This also adds a "cause" exception to have the full stacktrace.

Differential Revision: https://phabricator.services.mozilla.com/D108038

mobile/android/geckoview/src/main/java/org/mozilla/gecko/process/GeckoProcessManager.java

@@ -709,7 +709,9 @@ public final class GeckoProcessManager extends IProcessManager.Stub {
                 builder.append("; Type: ");
                 builder.append(type.toString());
 
-                result.completeExceptionally(new RuntimeException(builder.toString()));
+                final RuntimeException exception = new RuntimeException(builder.toString(), error);
+                Log.e(LOGTAG, "Could not bind to process", exception);
+                result.completeExceptionally(exception);
             });
     }