Add a way to fetch window frame metrics from NativeShellWindow

chrome/browser/ui/cocoa/extensions/shell_window_cocoa.mm

Index: chrome/browser/ui/cocoa/extensions/shell_window_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/extensions/shell_window_cocoa.mm b/chrome/browser/ui/cocoa/extensions/shell_window_cocoa.mm
index 048f2ca4e2d1277134a1fbdc63d2b6faca4e727a..38dc653fca4b73294f3e6ecdc4a55e5c5f7b95a6 100644
--- a/chrome/browser/ui/cocoa/extensions/shell_window_cocoa.mm
+++ b/chrome/browser/ui/cocoa/extensions/shell_window_cocoa.mm
@@ -656,6 +656,18 @@ bool ShellWindowCocoa::IsAlwaysOnTop() const {
   return false;
 }
 
+gfx::Rect ShellWindowCocoa::ContentBoundsForWindowBounds(
+    const gfx::Rect& window_bounds) const {
+  // TODO(jeremya): implement.
+  return window_bounds;
+}
+
+gfx::Rect ShellWindowCocoa::WindowBoundsForContentBounds(
+    const gfx::Rect& content_bounds) const {
+  // TODO(jeremya): implement.
+  return content_bounds;
+}
+
 void ShellWindowCocoa::WindowWillClose() {
   [window_controller_ setShellWindow:NULL];
   shell_window_->SaveWindowPosition();