ChildProcessSecurityPolicy: Deprecate bitmask-based permissions checks for files.

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 9295c345636d1983eccf18414392468016310eb9..62d90a92eb8658bd13f5dd8838c7249877a96e20 100644
--- a/content/public/browser/child_process_security_policy.h
+++ b/content/public/browser/child_process_security_policy.h
@@ -40,11 +40,7 @@ class ChildProcessSecurityPolicy {
   // Returns true iff |scheme| has been registered as a web-safe scheme.
   virtual bool IsWebSafeScheme(const std::string& scheme) = 0;
 
-  // Before servicing a child process's request to upload a file to the web, the
-  // browser should call this method to determine whether the process has the
-  // capability to upload the requested file.
-  virtual bool CanReadFile(int child_id, const base::FilePath& file) = 0;
-
+  // This permission grants only read access to a file.
   // Whenever the user picks a file from a <input type="file"> element, the
   // browser should call this function to grant the child process the capability
   // to upload the file to the web. Grants FILE_PERMISSION_READ_ONLY.
@@ -59,6 +55,17 @@ class ChildProcessSecurityPolicy {
   virtual void GrantCreateWriteFile(int child_id,
                                     const base::FilePath& file) = 0;
 
+  // These methods verify whether or not the child process has been granted
+  // permissions perform these functions on |file|.
+
+  // Before servicing a child process's request to upload a file to the web, the
+  // browser should call this method to determine whether the process has the
+  // capability to upload the requested file.
+  virtual bool CanReadFile(int child_id, const base::FilePath& file) = 0;
+  virtual bool CanWriteFile(int child_id, const base::FilePath& file) = 0;
+  virtual bool CanCreateFile(int child_id, const base::FilePath& file) = 0;
+  virtual bool CanCreateWriteFile(int child_id, const base::FilePath& file) = 0;
+
   // Grants read access permission to the given isolated file system
   // identified by |filesystem_id|. An isolated file system can be
   // created for a set of native files/directories (like dropped files)