Devtools: [WIP] Implement enhanced devtools extension language APIs

Source/devtools/devtools.gypi

Index: Source/devtools/devtools.gypi
diff --git a/Source/devtools/devtools.gypi b/Source/devtools/devtools.gypi
index 388d7c431a24393465b9098c91d706609eec87d4..bb35fab5aa2958f1df18c2550f3e7cadf8d99ca8 100644
--- a/Source/devtools/devtools.gypi
+++ b/Source/devtools/devtools.gypi
@@ -41,6 +41,7 @@
             '<@(devtools_core_base_files)',
             '<@(devtools_emulation_js_files)',
             '<@(devtools_host_js_files)',
+            '<@(devtools_languages_js_files)',
             '<@(devtools_main_js_files)',
             '<@(devtools_platform_js_files)',
             '<@(devtools_sdk_js_files)',
@@ -283,6 +284,9 @@
             'front_end/ui/treeoutline.js',
             'front_end/ui/ThrottledWidget.js'
         ],
+        'devtools_languages_js_files': [
+            'front_end/languages/LanguageService.js'
+        ],
         'devtools_main_js_files': [
             'front_end/main/AdvancedApp.js',
             'front_end/main/HelpScreenUntilReload.js',
@@ -309,6 +313,7 @@
             'front_end/extensions/module.json',
             'front_end/heap_snapshot_worker/module.json',
             'front_end/host/module.json',
+            'front_end/languages/module.json',
             'front_end/layers/module.json',
             'front_end/main/module.json',
             'front_end/network/module.json',
@@ -679,6 +684,7 @@
             '<@(devtools_emulated_devices_js_files)',
             '<@(devtools_extensions_js_files)',
             '<@(devtools_heap_snapshot_worker_js_files)',
+            '<@(devtools_languages_js_files)',
             '<@(devtools_layers_js_files)',
             '<@(devtools_network_js_files)',
             '<@(devtools_profiler_js_files)',