Mac: Add off-screen rendering support (issue #518).

- Build with the 10.7 SDK (set GYP_DEFINES='mac_sdk=10.7') to include Retina support in the cefclient OSR example.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1226 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/capi/cef_browser_capi.h

@@ -346,6 +346,17 @@ typedef struct _cef_browser_host_t {
   ///
   void (CEF_CALLBACK *was_hidden)(struct _cef_browser_host_t* self, int hidden);
 
+  ///
+  // Send a notification to the browser that the screen info has changed. The
+  // browser will then call cef_render_handler_t::GetScreenInfo to update the
+  // screen information with the new values. This simulates moving the webview
+  // window from one display to another, or changing the properties of the
+  // current display. This function is only used when window rendering is
+  // disabled.
+  ///
+  void (CEF_CALLBACK *notify_screen_info_changed)(
+      struct _cef_browser_host_t* self);
+
   ///
   // Invalidate the |dirtyRect| region of the view. The browser will call
   // cef_render_handler_t::OnPaint asynchronously with the updated regions. This