Add a way to fetch window frame metrics from NativeShellWindow

chrome/browser/ui/gtk/browser_window_gtk.cc

Index: chrome/browser/ui/gtk/browser_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/browser_window_gtk.cc b/chrome/browser/ui/gtk/browser_window_gtk.cc
index 606b7b33aebcf137d4f6fc006ac227e1ba7ce6f7..b0582f91b5b8ddd8cbf419fd74d40c914f3da1e3 100644
--- a/chrome/browser/ui/gtk/browser_window_gtk.cc
+++ b/chrome/browser/ui/gtk/browser_window_gtk.cc
@@ -712,6 +712,18 @@ bool BrowserWindowGtk::IsAlwaysOnTop() const {
   return false;
 }
 
+gfx::Rect BrowserWindowGtk::ContentBoundsForWindowBounds(
+    const gfx::Rect& window_bounds) const {
+  NOTIMPLEMENTED();
+  return gfx::Rect();
+}
+
+gfx::Rect BrowserWindowGtk::WindowBoundsForContentBounds(
+    const gfx::Rect& content_bounds) const {
+  NOTIMPLEMENTED();
+  return gfx::Rect();
+}
+
 gfx::NativeWindow BrowserWindowGtk::GetNativeWindow() {
   return window_;
 }