Add a way to fetch window frame metrics from NativeShellWindow

chrome/browser/ui/base_window.h

Index: chrome/browser/ui/base_window.h
diff --git a/chrome/browser/ui/base_window.h b/chrome/browser/ui/base_window.h
index deaa700d549103304280f8d383dedda94f4dce6e..4c76fdd8333594f37ef9af49eab66b14c898340e 100644
--- a/chrome/browser/ui/base_window.h
+++ b/chrome/browser/ui/base_window.h
@@ -79,6 +79,16 @@ class BaseWindow {
 
   // Returns true if a window is set to be always on top.
   virtual bool IsAlwaysOnTop() const = 0;
+
+  // Converts from window bounds (i.e. including window decorations) to content
+  // bounds (i.e. not including window decorations).
+  virtual gfx::Rect ContentBoundsForWindowBounds(
+      const gfx::Rect& window_bounds) const = 0;
+
+  // Converts from content bounds (i.e. not including window decorations) to
+  // window bounds (i.e. including window decorations).
+  virtual gfx::Rect WindowBoundsForContentBounds(
+      const gfx::Rect& content_bounds) const = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_BASE_WINDOW_H_