Create temporary cache_path directory if none is specified (issue #735).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@814 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

libcef/browser/context.h

@@ -15,6 +15,7 @@
 
 #include "base/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/scoped_temp_dir.h"
 #include "base/threading/platform_thread.h"
 
 namespace base {
@@ -87,6 +88,7 @@ class CefContext : public CefBase {
 
   CefSettings settings_;
   FilePath cache_path_;
+  ScopedTempDir cache_temp_dir_;
 
   // Map of browsers that currently exist.
   BrowserList browserlist_;