Moved Clear() implementation into wxDC using a new virtual CocoaGetBounds()

to determine the rect to clear.  Also added CocoaUnapplyTransformations()
to bring the coordinate system back into Cocoa coordinates for those
cases such as Clear() where it makes more sense.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31440 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/dcclient.h

@@ -27,8 +27,6 @@ public:
     wxWindowDC(wxWindow *win);
     ~wxWindowDC(void);
 
-    // NSView specific functions
-    virtual void Clear();
 protected:
     wxWindow *m_window;
     WX_NSView m_lockedNSView;
@@ -37,6 +35,7 @@ protected:
     virtual bool CocoaUnlockFocus();
     bool CocoaLockFocusOnNSView(WX_NSView nsview);
     bool CocoaUnlockFocusOnNSView();
+    virtual bool CocoaGetBounds(void *rectData);
 };
 
 class wxClientDC: public wxWindowDC