feat: enable Windows Control Overlay on Linux (#42682)

* feat: enable Windows Control Overlay on Linux

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* docs: update documentation for Linux WCO

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: initial symbol painting

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* test: enable WCO tests for Linux

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: add missing Layer include

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* chore: fix gn-check failure

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: enable BrowserWindow.setTitleBarOverlay on Linux

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* test: fix test for maximize event on Linux

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: geometry updating on BrowserWindow.setTitleBarOverlay

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* fix: crash when invalid titleBarStyle set

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* chore: clean up ordering and comments

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* Update docs/api/structures/base-window-options.md

Co-authored-by: Erick Zhao <erick@hotmail.ca>

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* feat: enable customizing symbolColor

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* docs: correct symbolColor reference

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* chore: update patches

Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>

* chore: remove Chrome-specific padding

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>
Co-authored-by: PatchUp <73610968+patchup[bot]@users.noreply.github.com>

patches/chromium/.patches

@@ -130,3 +130,4 @@ feat_add_support_for_missing_dialog_features_to_shell_dialogs.patch
 fix_font_face_resolution_when_renderer_is_blocked.patch
 feat_enable_passing_exit_code_on_service_process_crash.patch
 x11_use_localized_display_label_only_for_browser_process.patch
+feat_enable_customizing_symbol_color_in_framecaptionbutton.patch

patches/chromium/feat_enable_customizing_symbol_color_in_framecaptionbutton.patch

@@ -0,0 +1,80 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shelley Vohr <shelley.vohr@gmail.com>
+Date: Fri, 5 Apr 2024 11:07:22 +0200
+Subject: feat: enable customizing symbol color in FrameCaptionButton
+
+This enables customizing the symbol color on a given FrameCaptionButton
+for the Window Controls Overlay API on Linux. By default, the symbol color
+is dynamically calculated based on the background color of the button to
+ensure it has minimum contrast required to be accessible.
+
+This should be upstreamed to Chromium if possible.
+
+diff --git a/ui/views/window/frame_caption_button.cc b/ui/views/window/frame_caption_button.cc
+index 73e6020e3b9b6e0d12a8dea991f189b3ddeab14c..b38e5bd1408c26cbbfc995fc2ac5dc5983cc0db7 100644
+--- a/ui/views/window/frame_caption_button.cc
++++ b/ui/views/window/frame_caption_button.cc
+@@ -107,7 +107,7 @@ FrameCaptionButton::FrameCaptionButton(PressedCallback callback,
+ FrameCaptionButton::~FrameCaptionButton() = default;
+ 
+ // static
+-SkColor FrameCaptionButton::GetButtonColor(SkColor background_color) {
++SkColor FrameCaptionButton::GetAccessibleButtonColor(SkColor background_color) {
+   // Use IsDark() to change target colors instead of PickContrastingColor(), so
+   // that DefaultFrameHeader::GetTitleColor() (which uses different target
+   // colors) can change between light/dark targets at the same time.  It looks
+@@ -124,6 +124,22 @@ SkColor FrameCaptionButton::GetButtonColor(SkColor background_color) {
+       .color;
+ }
+ 
++SkColor FrameCaptionButton::GetButtonColor(SkColor background_color) {
++  // If the button color has been overridden, return that.
++  if (button_color_ != SkColor())
++    return button_color_;
++
++  return GetAccessibleButtonColor(background_color);
++}
++
++void FrameCaptionButton::SetButtonColor(SkColor button_color) {
++  if (button_color_ == button_color)
++    return;
++
++  button_color_ = button_color;
++  MaybeRefreshIconAndInkdropBaseColor();
++}
++
+ // static
+ float FrameCaptionButton::GetInactiveButtonColorAlphaRatio() {
+   return 0.38f;
+diff --git a/ui/views/window/frame_caption_button.h b/ui/views/window/frame_caption_button.h
+index 0ac923a3ca6052d499ed7c1a4f156b0f19ad4e64..3164f79828218d57843eba823e0f14ff456b2df4 100644
+--- a/ui/views/window/frame_caption_button.h
++++ b/ui/views/window/frame_caption_button.h
+@@ -44,8 +44,18 @@ class VIEWS_EXPORT FrameCaptionButton : public Button {
+   FrameCaptionButton& operator=(const FrameCaptionButton&) = delete;
+   ~FrameCaptionButton() override;
+ 
++  // Gets the color to use for a frame caption button with accessible contrast
++  // to the given background color.
++  static SkColor GetAccessibleButtonColor(SkColor background_color);
++
+   // Gets the color to use for a frame caption button.
+-  static SkColor GetButtonColor(SkColor background_color);
++  SkColor GetButtonColor(SkColor background_color);
++
++  // Sets the color to use for a frame caption button.
++  // The color is by default calculated to be an accessible contrast
++  // to the background color, so you should keep that in mind when
++  // overriding that behavior.
++  void SetButtonColor(SkColor button_color);
+ 
+   // Gets the alpha ratio for the colors of inactive frame caption buttons.
+   static float GetInactiveButtonColorAlphaRatio();
+@@ -134,6 +144,7 @@ class VIEWS_EXPORT FrameCaptionButton : public Button {
+   // TODO(b/292154873): Store the foreground color instead of the background
+   // color for the SkColor type.
+   absl::variant<ui::ColorId, SkColor> color_ = gfx::kPlaceholderColor;
++  SkColor button_color_ = SkColor();
+ 
+   // Whether the button should be painted as active.
+   bool paint_as_active_ = false;