Adds support for POST request with bodies on WKWebView.

ios/web/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//testing/test.gni")
 import("//ios/web/js_compile.gni")
 
 config("config") {
   visibility = [ ":web" ]
 
@@ skipping 198 matching lines @@
     "web_state/js/credential_util.h",
     "web_state/js/credential_util.mm",
     "web_state/js/crw_js_early_script_manager.h",
     "web_state/js/crw_js_early_script_manager.mm",
     "web_state/js/crw_js_injection_manager.mm",
     "web_state/js/crw_js_injection_receiver.mm",
     "web_state/js/crw_js_invoke_parameter_queue.h",
     "web_state/js/crw_js_invoke_parameter_queue.mm",
     "web_state/js/crw_js_plugin_placeholder_manager.h",
     "web_state/js/crw_js_plugin_placeholder_manager.mm",
+    "web_state/js/crw_js_post_request_loader.h",
+    "web_state/js/crw_js_post_request_loader.h",
     "web_state/js/crw_js_window_id_manager.h",
     "web_state/js/crw_js_window_id_manager.mm",
     "web_state/js/page_script_util.h",
     "web_state/js/page_script_util.mm",
     "web_state/ui/crw_context_menu_provider.h",
     "web_state/ui/crw_context_menu_provider.mm",
     "web_state/ui/crw_debug_web_view.h",
     "web_state/ui/crw_debug_web_view.mm",
     "web_state/ui/crw_generic_content_view.mm",
     "web_state/ui/crw_simple_web_view_controller.h",
@@ skipping 193 matching lines @@
     "url_util_unittest.cc",
     "weak_nsobject_counter_unittest.mm",
     "web_state/crw_pass_kit_downloader_unittest.mm",
     "web_state/crw_web_view_scroll_view_proxy_unittest.mm",
     "web_state/js/common_js_unittest.mm",
     "web_state/js/core_js_unittest.mm",
     "web_state/js/credential_util_unittest.mm",
     "web_state/js/crw_js_early_script_manager_unittest.mm",
     "web_state/js/crw_js_injection_manager_unittest.mm",
     "web_state/js/crw_js_invoke_parameter_queue_unittest.mm",
+    "web_state/js/crw_js_post_request_loader_unittest.mm",
     "web_state/js/crw_js_window_id_manager_unittest.mm",
     "web_state/js/page_script_util_unittest.mm",
     "web_state/ui/crw_static_file_web_view_unittest.mm",
     "web_state/ui/crw_ui_simple_web_view_controller_unittest.mm",
     "web_state/ui/crw_web_controller_container_view_unittest.mm",
     "web_state/ui/crw_web_controller_observer_unittest.mm",
     "web_state/ui/crw_web_controller_unittest.mm",
     "web_state/ui/crw_wk_script_message_router_unittest.mm",
     "web_state/ui/crw_wk_simple_web_view_controller_unittest.mm",
     "web_state/ui/crw_wk_web_view_crash_detector_unittest.mm",
@@ skipping 51 matching lines @@
     ":web_bundle_ui",
     ":web_bundle_wk",
   ]
 
   sources = [
     "web_state/js/resources/plugin_placeholder.js",
     "web_state/js/resources/window_id.js",
     "webui/resources/web_ui.js",
   ]
 }