linux: unify all the dialog layout code for visual consistency.

chrome/common/gtk_util.cc

Index: chrome/common/gtk_util.cc
diff --git a/chrome/common/gtk_util.cc b/chrome/common/gtk_util.cc
index f0d5ea1b2992f0f1bf5f8aa41039912e2de7f55a..4b25a4b095b5414c628692ef47b5037119e58723 100644
--- a/chrome/common/gtk_util.cc
+++ b/chrome/common/gtk_util.cc
@@ -54,4 +54,32 @@ void RemoveAllChildren(GtkWidget* container) {
   gtk_container_foreach(GTK_CONTAINER(container), RemoveWidget, container);
 }
 
+void InitRCStyles() {
+  static const char kRCText[] =
+      // Make our dialogs styled like the GNOME HIG.
+      // TODO(evanm): content-area-spacing doesn't seem to work -- maybe it
+      // was introduced in a later version of GTK?
+      "style \"gnome-dialog\" {\n"
+      "  xthickness = 12\n"
+      "  GtkDialog::action-area-border = 0\n"
+      "  GtkDialog::button-spacing = 6\n"
+      "  GtkDialog::content-area-spacing = 18\n"
+      "  GtkDialog::content-area-border = 12\n"
+      "}\n"
+      // Note we set it at the "application" priority, so users can override.
+      "widget \"GtkDialog\" style : application \"gnome-dialog\"\n"
+
+      // Make our about dialog special.
+      "style \"about-dialog\" {\n"
+      "  GtkDialog::action-area-border = 12\n"
+      "  GtkDialog::button-spacing = 6\n"
+      "  GtkDialog::content-area-spacing = 18\n"
+      "  GtkDialog::content-area-border = 0\n"
+      "}\n"
+      // Note we set it at the "application" priority, so users can override.
+      "widget \"about-dialog\" style : application \"about-dialog\"\n";
+
+  gtk_rc_parse_string(kRCText);
+}
+
 }  // namespace gtk_util