[Merge to M59] Gtk3: Add background class to tooltips

chrome/browser/ui/libgtkui/native_theme_gtk3.cc

 // Copyright 2016 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 "chrome/browser/ui/libgtkui/native_theme_gtk3.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtkui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtkui/chrome_gtk_menu_subclasses.h"
@@ skipping 19 matching lines @@
                                          const gchar* prop_name) {
   GValue layout = G_VALUE_INIT;
   g_value_init(&layout, G_TYPE_STRING);
   g_object_get_property(G_OBJECT(settings), prop_name, &layout);
   DCHECK(G_VALUE_HOLDS_STRING(&layout));
   std::string prop_value(g_value_get_string(&layout));
   g_value_unset(&layout);
   return prop_value;
 }
 
+ScopedStyleContext GetTooltipContext() {
+  return AppendCssNodeToStyleContext(
+      nullptr, GtkVersionCheck(3, 20) ? "#tooltip.background"
+                                      : "GtkWindow#window.background.tooltip");
+}
+
 SkBitmap GetWidgetBitmap(const gfx::Size& size,
                          GtkStyleContext* context,
                          BackgroundRenderMode bg_mode,
                          bool render_frame) {
   DCHECK(bg_mode != BG_RENDER_NONE || render_frame);
   SkBitmap bitmap;
   bitmap.allocN32Pixels(size.width(), size.height());
   bitmap.eraseColor(0);
 
   CairoSurface surface(bitmap);
@@ skipping 186 matching lines @@
       return GetFgColor(GtkVersionCheck(3, 20)
                             ? "GtkTextView#textview.view #text #selection"
                             : "GtkTextView.view:selected");
     case ui::NativeTheme::kColorId_TextfieldSelectionBackgroundFocused:
       return GetSelectionBgColor(
           GtkVersionCheck(3, 20) ? "GtkTextView#textview.view #text #selection"
                                  : "GtkTextView.view:selected");
 
     // Tooltips
     case ui::NativeTheme::kColorId_TooltipBackground:
-      return GetBgColor("GtkTooltip#tooltip");
-    case ui::NativeTheme::kColorId_TooltipText:
-      return GetFgColor("GtkTooltip#tooltip GtkLabel");
+      return GetBgColorFromStyleContext(GetTooltipContext());
+    case ui::NativeTheme::kColorId_TooltipText: {
+      auto context = GetTooltipContext();
+      context = AppendCssNodeToStyleContext(context, "GtkLabel");
+      return GetFgColorFromStyleContext(context);
+    }
 
     // Trees and Tables (implemented on GTK using the same class)
     case ui::NativeTheme::kColorId_TableBackground:
     case ui::NativeTheme::kColorId_TreeBackground:
       return GetBgColor(
           "GtkTreeView#treeview.view GtkTreeView#treeview.view.cell");
     case ui::NativeTheme::kColorId_TableText:
     case ui::NativeTheme::kColorId_TreeText:
     case ui::NativeTheme::kColorId_TableGroupingIndicatorColor:
       return GetFgColor(
@@ skipping 143 matching lines @@
   g_type_class_unref(g_type_class_ref(gtk_label_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_menu_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_menu_bar_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_menu_item_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_range_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_scrollbar_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_scrolled_window_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_separator_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_spinner_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_text_view_get_type()));
-  g_type_class_unref(g_type_class_ref(gtk_tooltip_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_tree_view_get_type()));
   g_type_class_unref(g_type_class_ref(gtk_window_get_type()));
 
   g_signal_connect_after(gtk_settings_get_default(), "notify::gtk-theme-name",
                          G_CALLBACK(OnThemeChangedThunk), this);
   OnThemeChanged(gtk_settings_get_default(), nullptr);
 }
 
 NativeThemeGtk3::~NativeThemeGtk3() {
   NOTREACHED();
@@ skipping 207 matching lines @@
 
   if (frame_top_area.incognito) {
     bitmap = SkBitmapOperations::CreateHSLShiftedBitmap(
         bitmap, kDefaultTintFrameIncognito);
   }
 
   canvas->drawBitmap(bitmap, rect.x(), rect.y());
 }
 
 }  // namespace libgtkui