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

- Popup menus, drag&drop and GPU acceleration are not currently supported.
- Testing is enabled in cefclient by passing the "off-screen-rendering-enabled" command-line flag.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@919 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/browser_context.cc

@@ -172,7 +172,8 @@ class CefSpeechRecognitionPreferences
 
 }  // namespace
 
-CefBrowserContext::CefBrowserContext() {
+CefBrowserContext::CefBrowserContext()
+    : use_osr_next_contents_view_(false) {
   // Initialize the request context getter.
   url_request_getter_ = new CefURLRequestContextGetter(
       false,
@@ -275,3 +276,11 @@ content::SpeechRecognitionPreferences*
 quota::SpecialStoragePolicy* CefBrowserContext::GetSpecialStoragePolicy() {
   return NULL;
 }
+
+bool CefBrowserContext::use_osr_next_contents_view() const {
+  return use_osr_next_contents_view_;
+}
+
+void CefBrowserContext::set_use_osr_next_contents_view(bool override) {
+  use_osr_next_contents_view_ = override;
+}