Lazily create the clipboard owner window. CreateWindow can take ~.5ms, and w...

base/clipboard.h

Index: base/clipboard.h
===================================================================
--- base/clipboard.h	(revision 5863)
+++ base/clipboard.h	(working copy)
@@ -175,7 +175,12 @@
   // Free a handle depending on its type (as intuited from format)
   static void FreeData(FormatType format, HANDLE data);
 
-  HWND clipboard_owner_;
+  // Return the window that should be the clipboard owner, creating it
+  // if neccessary.  Marked const for lazily initialization by const methods.
+  HWND GetClipboardWindow() const;
+
+  // Mark this as mutable so const methods can still do lazy initialization.

[Peter Kasting, 2008/11/25 06:46:13]

Nit: Should probably comment that no one should access this directly (unless
they don't want to create it, like the destructor).

Also probably don't need the explanation on mutable, it's sort of obvious, but
feel free to leave it if you think it adds clarity

+  mutable HWND clipboard_owner_;
 #elif defined(OS_LINUX)
   // Data is stored in the |clipboard_data_| map until it is saved to the system
   // clipboard. The Store* functions save data to the |clipboard_data_| map. The