[GreenDevFloaty]: Add floaty window content and a panel.

Note: This is just a prototype and will not go to production as-is.

Background for the prototypes:
go/greendev-protos-launch-design-doc  (internal only)

Bug: 466071312
Change-Id: I77192b7913c4ff9d29d99d294c74ab789a6e72c0
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7545069
Reviewed-by: Alina Varkki <alinavarkki@chromium.org>
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>

Author: finnurbreki

config/gni/devtools_grd_files.gni

@@ -386,6 +386,9 @@ grd_files_bundled_sources = [
   "front_end/entrypoints/formatter_worker/FormatterActions.js",
   "front_end/entrypoints/formatter_worker/formatter_worker-entrypoint.js",
   "front_end/entrypoints/formatter_worker/formatter_worker.js",
+  "front_end/entrypoints/greendev_floaty/FloatyEntrypoint.js",
+  "front_end/entrypoints/greendev_floaty/floaty.css",
+  "front_end/entrypoints/greendev_floaty/floaty.html",
   "front_end/entrypoints/heap_snapshot_worker/heap_snapshot_worker-entrypoint.js",
   "front_end/entrypoints/heap_snapshot_worker/heap_snapshot_worker.js",
   "front_end/entrypoints/inspector/inspector.js",
@@ -702,6 +705,8 @@ grd_files_bundled_sources = [
   "front_end/panels/event_listeners/event_listeners.js",
   "front_end/panels/explain/explain-meta.js",
   "front_end/panels/explain/explain.js",
+  "front_end/panels/greendev/greendev-meta.js",
+  "front_end/panels/greendev/greendev.js",
   "front_end/panels/issues/components/components.js",
   "front_end/panels/issues/issues-meta.js",
   "front_end/panels/issues/issues.js",
@@ -1646,6 +1651,9 @@ grd_files_unbundled_sources = [
   "front_end/panels/explain/ActionDelegate.js",
   "front_end/panels/explain/components/ConsoleInsight.js",
   "front_end/panels/explain/components/consoleInsight.css.js",
+  "front_end/panels/greendev/GreenDevPanel.css.js",
+  "front_end/panels/greendev/GreenDevPanel.js",
+  "front_end/panels/greendev/GreenDevShared.js",
   "front_end/panels/issues/AffectedBlockedByResponseView.js",
   "front_end/panels/issues/AffectedCookiesView.js",
   "front_end/panels/issues/AffectedDescendantsWithinSelectElementView.js",

front_end/BUILD.gn

@@ -19,6 +19,8 @@ group("front_end") {
     "entrypoints/device_mode_emulation_frame",
     "entrypoints/devtools_app:entrypoint",
     "entrypoints/formatter_worker:worker_entrypoint",
+    "entrypoints/greendev_floaty:copy_floaty_resources",
+    "entrypoints/greendev_floaty:floaty_entrypoint",
     "entrypoints/heap_snapshot_worker:worker_entrypoint",
     "entrypoints/inspector:entrypoint",
     "entrypoints/js_app:entrypoint",

front_end/core/sdk/OverlayModel.ts

@@ -925,6 +925,8 @@ export const enum Events {
   PERSISTENT_FLEX_CONTAINER_OVERLAY_STATE_CHANGED = 'PersistentFlexContainerOverlayStateChanged',
   PERSISTENT_SCROLL_SNAP_OVERLAY_STATE_CHANGED = 'PersistentScrollSnapOverlayStateChanged',
   PERSISTENT_CONTAINER_QUERY_OVERLAY_STATE_CHANGED = 'PersistentContainerQueryOverlayStateChanged',
+  INSPECT_PANEL_SHOW_REQUESTED = 'InspectPanelShowRequested',
+  INSPECTED_ELEMENT_WINDOW_RESTORED = 'InspectedElementWindowRestored',
 }
 
 export interface ChangedNodeId {
@@ -941,6 +943,8 @@ export interface EventTypes {
   [Events.PERSISTENT_FLEX_CONTAINER_OVERLAY_STATE_CHANGED]: ChangedNodeId;
   [Events.PERSISTENT_SCROLL_SNAP_OVERLAY_STATE_CHANGED]: ChangedNodeId;
   [Events.PERSISTENT_CONTAINER_QUERY_OVERLAY_STATE_CHANGED]: ChangedNodeId;
+  [Events.INSPECT_PANEL_SHOW_REQUESTED]: number;
+  [Events.INSPECTED_ELEMENT_WINDOW_RESTORED]: number;
 }
 
 export interface Highlighter {

front_end/entrypoints/devtools_app/BUILD.gn

@@ -18,6 +18,7 @@ devtools_entrypoint("entrypoint") {
     "../../panels/developer_resources:meta",
     "../../panels/elements:meta",
     "../../panels/emulation:meta",
+    "../../panels/greendev:meta",
     "../../panels/issues:meta",
     "../../panels/layer_viewer:meta",
     "../../panels/layers:meta",

front_end/entrypoints/devtools_app/devtools_app.ts

@@ -5,6 +5,7 @@ import '../shell/shell.js';
 import '../../panels/css_overview/css_overview-meta.js';
 import '../../panels/elements/elements-meta.js';
 import '../../panels/browser_debugger/browser_debugger-meta.js';
+import '../../panels/greendev/greendev-meta.js';
 import '../../panels/network/network-meta.js';
 import '../../panels/security/security-meta.js';
 import '../../panels/emulation/emulation-meta.js';

front_end/entrypoints/greendev_floaty/BUILD.gn

@@ -0,0 +1,46 @@
+# Copyright 2026 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("../../../scripts/build/ninja/copy.gni")
+import("../../../scripts/build/ninja/devtools_entrypoint.gni")
+import("../../../scripts/build/ninja/generate_css.gni")
+import("../visibility.gni")
+
+generate_css("css_files") {
+  sources = [ "floaty.css" ]
+}
+
+copy_to_gen_with_grd("copy_floaty_resources") {
+  sources = [
+    "floaty.css",
+    "floaty.html",
+  ]
+  visibility = [ "*" ]
+}
+
+devtools_entrypoint("floaty_entrypoint") {
+  entrypoint = "FloatyEntrypoint.ts"
+
+  deps = [
+    "../../core/common:bundle",
+    "../../core/host:bundle",
+    "../../core/i18n:bundle",
+    "../../core/root:bundle",
+    "../../core/sdk:bundle",
+    "../../core/sdk:meta",
+    "../../entrypoints/inspector_main:meta",
+    "../../entrypoints/main:meta",
+    "../../foundation:bundle",
+    "../../generated",
+    "../../models/ai_assistance:bundle",
+    "../../models/workspace:meta",
+    "../../panels/greendev:greendev_shared",
+    "../../panels/sensors:meta",
+  ]
+
+  visibility = [
+    ":*",
+    "../../:*",
+  ]
+}