Gtk3: Fix button outline sizing on different GTK minor versions

chrome/browser/ui/libgtkui/gtk_ui.cc

Index: chrome/browser/ui/libgtkui/gtk_ui.cc
diff --git a/chrome/browser/ui/libgtkui/gtk_ui.cc b/chrome/browser/ui/libgtkui/gtk_ui.cc
index dd59476a70333754846827023d83ff534227c372..e17e70c07bf1e0970464edb8d4429d0db9d5105d 100644
--- a/chrome/browser/ui/libgtkui/gtk_ui.cc
+++ b/chrome/browser/ui/libgtkui/gtk_ui.cc
@@ -177,8 +177,36 @@ class GtkButtonImageSource : public gfx::ImageSkiaSource {
     gtk_style_context_set_state(context, state_flags);
     gtk_render_background(context, cr, 0, 0, width, height);
     gtk_render_frame(context, cr, 0, 0, width, height);
-    if (focus_)
-      gtk_render_focus(context, cr, 0, 0, width, height);
+    if (focus_) {
+      gfx::Rect focus_rect(width, height);
+
+      if (!GtkVersionCheck(3, 14)) {
+        gint focus_pad;
+        gtk_style_context_get_style(context, "focus-padding", &focus_pad,
+                                    nullptr);
+        focus_rect.Inset(focus_pad, focus_pad);
+
+        if (state_ == ui::NativeTheme::kPressed) {
+          gint child_displacement_x, child_displacement_y;
+          gboolean displace_focus;
+          gtk_style_context_get_style(
+              context, "child-displacement-x", &child_displacement_x,
+              "child-displacement-y", &child_displacement_y, "displace-focus",
+              &displace_focus, nullptr);
+          if (displace_focus)
+            focus_rect.Offset(child_displacement_x, child_displacement_y);
+        }
+      }
+
+      if (!GtkVersionCheck(3, 20)) {
+        GtkBorder border;
+        gtk_style_context_get_border(context, state_flags, &border);
+        focus_rect.Inset(border.left, border.top, border.right, border.bottom);
+      }
+
+      gtk_render_focus(context, cr, focus_rect.x(), focus_rect.y(),
+                       focus_rect.width(), focus_rect.height());
+    }
 #endif
 
     cairo_destroy(cr);