Change media galleries to external file system type to add toURL support

content/public/browser/child_process_security_policy.h

Index: content/public/browser/child_process_security_policy.h
diff --git a/content/public/browser/child_process_security_policy.h b/content/public/browser/child_process_security_policy.h
index 2f462b28a18aace52484037319fc3e8d7865ccad..261bf58f1810ee8d559a83149a44b222f2c8039b 100644
--- a/content/public/browser/child_process_security_policy.h
+++ b/content/public/browser/child_process_security_policy.h
@@ -51,6 +51,12 @@ class ChildProcessSecurityPolicy {
   virtual void GrantCreateReadWriteFile(int child_id,
                                         const base::FilePath& file) = 0;
 
+  // This permission grants copy-into permission for |dir|.
+  virtual void GrantCopyInto(int child_id, const base::FilePath& dir) = 0;
+
+  // This permission grants delete permission for |dir|.
+  virtual void GrantDeleteFrom(int child_id, const base::FilePath& dir) = 0;
+
   // These methods verify whether or not the child process has been granted
   // permissions perform these functions on |file|.