Gtk3: Fix button outline sizing on different GTK minor versions

chrome/browser/ui/libgtkui/gtk_ui.cc

 // Copyright (c) 2012 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/gtk_ui.h"
 
 #include <X11/Xcursor/Xcursor.h>
 #include <dlfcn.h>
 #include <math.h>
 #include <pango/pango.h>
@@ skipping 159 matching lines @@
         is_blue_ ? "GtkButton#button.default.suggested-action"
                  : "GtkButton#button");
     GtkStateFlags state_flags = StateToStateFlags(state_);
     if (focus_) {
       state_flags =
           static_cast<GtkStateFlags>(state_flags | GTK_STATE_FLAG_FOCUSED);
     }
     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);
     cairo_surface_destroy(surface);
 
     return gfx::ImageSkiaRep(border, scale);
   }
 
  private:
   bool is_blue_;
@@ skipping 849 matching lines @@
 
 float GtkUi::GetDeviceScaleFactor() const {
   return device_scale_factor_;
 }
 
 }  // namespace libgtkui
 
 views::LinuxUI* BuildGtkUi() {
   return new libgtkui::GtkUi;
 }