[web] Reland Support custom url strategies (flutter#21702)

Author: mdebbar

ci/licenses_golden/licenses_flutter

@@ -426,7 +426,6 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/alarm_clock.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/assets.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/bitmap_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/browser_detection.dart
-FILE: ../../../flutter/lib/web_ui/lib/src/engine/browser_location.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvas_pool.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/canvaskit/canvaskit_api.dart
@@ -463,7 +462,9 @@ FILE: ../../../flutter/lib/web_ui/lib/src/engine/dom_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/dom_renderer.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/engine_canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/frame_reference.dart
-FILE: ../../../flutter/lib/web_ui/lib/src/engine/history.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/history/history.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/history/js_url_strategy.dart
+FILE: ../../../flutter/lib/web_ui/lib/src/engine/history/url_strategy.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/backdrop_filter.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/canvas.dart
 FILE: ../../../flutter/lib/web_ui/lib/src/engine/html/clip.dart

lib/web_ui/lib/src/engine.dart

@@ -26,7 +26,6 @@ part 'engine/alarm_clock.dart';
 part 'engine/assets.dart';
 part 'engine/bitmap_canvas.dart';
 part 'engine/browser_detection.dart';
-part 'engine/browser_location.dart';
 part 'engine/canvaskit/canvas.dart';
 part 'engine/canvaskit/canvaskit_canvas.dart';
 part 'engine/canvaskit/canvaskit_api.dart';
@@ -63,7 +62,9 @@ part 'engine/dom_canvas.dart';
 part 'engine/dom_renderer.dart';
 part 'engine/engine_canvas.dart';
 part 'engine/frame_reference.dart';
-part 'engine/history.dart';
+part 'engine/navigation/history.dart';
+part 'engine/navigation/js_url_strategy.dart';
+part 'engine/navigation/url_strategy.dart';
 part 'engine/html/backdrop_filter.dart';
 part 'engine/html/canvas.dart';
 part 'engine/html/clip.dart';