Mojo: Add test utils to go between a ScopedPlatformHandle and a ScopedFILE.

mojo/common/test/test_utils.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_COMMON_TEST_TEST_UTILS_H_
 #define MOJO_COMMON_TEST_TEST_UTILS_H_
 
 #include <stddef.h>
+#include <stdio.h>
 
 #include <string>
 
 #include "base/files/file_path.h"
+#include "base/files/scoped_file.h"
+#include "mojo/embedder/platform_handle.h"
+#include "mojo/embedder/scoped_platform_handle.h"
 
 namespace mojo {
-
-namespace embedder {
-struct PlatformHandle;
-}
-
 namespace test {
 
 // On success, |bytes_written| is updated to the number of bytes written;
 // otherwise it is untouched.
 bool BlockingWrite(const embedder::PlatformHandle& handle,
                    const void* buffer,
                    size_t bytes_to_write,
                    size_t* bytes_written);
 
 // On success, |bytes_read| is updated to the number of bytes read; otherwise it
 // is untouched.
 bool BlockingRead(const embedder::PlatformHandle& handle,
                   void* buffer,
                   size_t buffer_size,
                   size_t* bytes_read);
 
 // If the read is done successfully or would block, the function returns true
 // and updates |bytes_read| to the number of bytes read (0 if the read would
 // block); otherwise it returns false and leaves |bytes_read| untouched.
 // |handle| must already be in non-blocking mode.
 bool NonBlockingRead(const embedder::PlatformHandle& handle,
                      void* buffer,
                      size_t buffer_size,
                      size_t* bytes_read);
 
+// Gets a (scoped) |PlatformHandle| from the given (scoped) |FILE|.
+embedder::ScopedPlatformHandle PlatformHandleFromFILE(base::ScopedFILE fp);
+
+// Gets a (scoped) |FILE| from a (scoped) |PlatformHandle|.
+base::ScopedFILE FILEFromPlatformHandle(embedder::ScopedPlatformHandle h,
+                                        const char* mode);
+
 // Returns the path to the mojom js bindings file.
 base::FilePath GetFilePathForJSResource(const std::string& path);
 
 }  // namespace test
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_TEST_TEST_UTILS_H_