Respect animation settings on Linux

GTK has a setting to globally disable animations.  This CL uses it to
disable animations in Chrome when the setting is set to disabled.

R=sky

Bug: 1043808
Change-Id: Idcaee97fdad3a26bb795d496599c745c83da6d9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2011442Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734314}

chrome/browser/ui/libgtkui/gtk_ui.cc

@@ -740,6 +740,13 @@ bool GtkUi::PreferDarkTheme() const {
   return dark;
 }
 
+bool GtkUi::AnimationsEnabled() const {
+  gboolean animations_enabled = false;
+  g_object_get(gtk_settings_get_default(), "gtk-enable-animations",
+               &animations_enabled, nullptr);
+  return animations_enabled;
+}
+
 #if BUILDFLAG(ENABLE_NATIVE_WINDOW_NAV_BUTTONS)
 std::unique_ptr<views::NavButtonProvider> GtkUi::CreateNavButtonProvider() {
   if (GtkVersionCheck(3, 14))

chrome/browser/ui/libgtkui/gtk_ui.h

@@ -100,6 +100,7 @@ class GtkUi : public views::LinuxUI {
   void RemoveDeviceScaleFactorObserver(
       views::DeviceScaleFactorObserver* observer) override;
   bool PreferDarkTheme() const override;
+  bool AnimationsEnabled() const override;
 #if BUILDFLAG(ENABLE_NATIVE_WINDOW_NAV_BUTTONS)
   std::unique_ptr<views::NavButtonProvider> CreateNavButtonProvider() override;
 #endif

ui/gfx/animation/BUILD.gn

@@ -51,6 +51,14 @@ jumbo_component("animation") {
     sources += [ "animation_win.cc" ]
   }
 
+  if (is_desktop_linux) {
+    sources += [
+      "animation_linux.cc",
+      "animation_settings_provider_linux.cc",
+      "animation_settings_provider_linux.h",
+    ]
+  }
+
   if (!is_android) {
     sources += [
       "throb_animation.cc",

ui/gfx/animation/animation.cc

@@ -112,17 +112,18 @@ bool Animation::ShouldRenderRichAnimation() {
          RichAnimationRenderMode::FORCE_ENABLED;
 }
 
-#if !defined(OS_WIN) && (!defined(OS_MACOSX) || defined(OS_IOS))
+#if defined(OS_ANDROID) || defined(OS_CHROMEOS) || defined(OS_IOS) || \
+    defined(OS_FUCHSIA)
 // static
 bool Animation::ShouldRenderRichAnimationImpl() {
-  // Defined in platform specific file for Windows and OSX.
   return true;
+  // Defined in platform specific file for Windows and OSX and Linux.
 }
 
 // static
 bool Animation::ScrollAnimationsEnabledBySystem() {
-  // Defined in platform specific files for Windows and OSX.
   return true;
+  // Defined in platform specific files for Windows and OSX and Linux.
 }
 
 #if !defined(OS_ANDROID)
@@ -136,7 +137,8 @@ void Animation::UpdatePrefersReducedMotion() {
   prefers_reduced_motion_ = false;
 }
 #endif  // !defined(OS_ANDROID)
-#endif  // !defined(OS_WIN) && (!defined(OS_MACOSX) || defined(OS_IOS))
+#endif  // defined(OS_ANDROID) || defined(OS_CHROMEOS) || defined(OS_IOS) ||
+        // defined(OS_FUCHSIA)
 
 // static
 bool Animation::PrefersReducedMotion() {

ui/gfx/animation/animation_linux.cc

+// Copyright 2020 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.
+
+#include "ui/gfx/animation/animation.h"
+
+#include "ui/gfx/animation/animation_settings_provider_linux.h"
+
+namespace gfx {
+
+namespace {
+
+// GTK only has a global setting for whether animations should be enabled.  So
+// use it for all of the specific settings that Chrome needs.
+bool AnimationsEnabled() {
+  auto* provider = AnimationSettingsProviderLinux::GetInstance();
+  return !provider || provider->AnimationsEnabled();
+}
+
+}  // namespace
+
+// static
+bool Animation::ShouldRenderRichAnimationImpl() {
+  return AnimationsEnabled();
+}
+
+// static
+bool Animation::ScrollAnimationsEnabledBySystem() {
+  return AnimationsEnabled();
+}
+
+// static
+void Animation::UpdatePrefersReducedMotion() {
+  prefers_reduced_motion_ = !AnimationsEnabled();
+}
+
+}  // namespace gfx

ui/gfx/animation/animation_settings_provider_linux.cc

+// Copyright 2020 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.
+
+#include "ui/gfx/animation/animation_settings_provider_linux.h"
+
+#include "base/logging.h"
+
+namespace gfx {
+
+// static
+AnimationSettingsProviderLinux* AnimationSettingsProviderLinux::instance_ =
+    nullptr;
+
+// static
+AnimationSettingsProviderLinux* AnimationSettingsProviderLinux::GetInstance() {
+  return instance_;
+}
+
+AnimationSettingsProviderLinux::AnimationSettingsProviderLinux() {
+  DCHECK(!instance_);
+  instance_ = this;
+}
+
+AnimationSettingsProviderLinux::~AnimationSettingsProviderLinux() {
+  DCHECK_EQ(instance_, this);
+  instance_ = nullptr;
+}
+
+}  // namespace gfx

ui/gfx/animation/animation_settings_provider_linux.h

+// Copyright 2020 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.
+
+#ifndef UI_GFX_ANIMATION_ANIMATION_SETTINGS_PROVIDER_LINUX_H_
+#define UI_GFX_ANIMATION_ANIMATION_SETTINGS_PROVIDER_LINUX_H_
+
+#include "base/macros.h"
+#include "ui/gfx/animation/animation_export.h"
+
+namespace gfx {
+
+class ANIMATION_EXPORT AnimationSettingsProviderLinux {
+ public:
+  virtual ~AnimationSettingsProviderLinux();
+
+  // Indicates if animations are enabled by the toolkit.
+  virtual bool AnimationsEnabled() const = 0;
+
+  static AnimationSettingsProviderLinux* GetInstance();
+
+ protected:
+  AnimationSettingsProviderLinux();
+
+ private:
+  static AnimationSettingsProviderLinux* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(AnimationSettingsProviderLinux);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_ANIMATION_ANIMATION_SETTINGS_PROVIDER_LINUX_H_

ui/views/linux_ui/linux_ui.h

@@ -14,6 +14,7 @@
 #include "ui/base/cursor/cursor_theme_manager_linux.h"
 #include "ui/base/ime/linux/linux_input_method_context_factory.h"
 #include "ui/base/ime/linux/text_edit_key_bindings_delegate_auralinux.h"
+#include "ui/gfx/animation/animation_settings_provider_linux.h"
 #include "ui/gfx/skia_font_delegate.h"
 #include "ui/shell_dialogs/shell_dialog_linux.h"
 #include "ui/views/buildflags.h"
@@ -58,7 +59,8 @@ class VIEWS_EXPORT LinuxUI : public ui::LinuxInputMethodContextFactory,
                              public gfx::SkiaFontDelegate,
                              public ui::ShellDialogLinux,
                              public ui::TextEditKeyBindingsDelegateAuraLinux,
-                             public ui::CursorThemeManagerLinux {
+                             public ui::CursorThemeManagerLinux,
+                             public gfx::AnimationSettingsProviderLinux {
  public:
   using UseSystemThemeCallback =
       base::RepeatingCallback<bool(aura::Window* window)>;