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

mojo/common/test/test_utils_posix.cc

Index: mojo/common/test/test_utils_posix.cc
diff --git a/mojo/common/test/test_utils_posix.cc b/mojo/common/test/test_utils_posix.cc
index b99ad3b636e2eaa97588dcb83d96aed1254290ae..0072d0a597144602ed7d2213e5d4ad0a725799a4 100644
--- a/mojo/common/test/test_utils_posix.cc
+++ b/mojo/common/test/test_utils_posix.cc
@@ -10,7 +10,6 @@
 #include "base/base_paths.h"
 #include "base/path_service.h"
 #include "base/posix/eintr_wrapper.h"
-#include "mojo/embedder/platform_handle.h"
 
 namespace mojo {
 namespace test {
@@ -75,6 +74,21 @@ bool NonBlockingRead(const embedder::PlatformHandle& handle,
   return true;
 }
 
+embedder::ScopedPlatformHandle PlatformHandleFromFILE(base::ScopedFILE fp) {
+  CHECK(fp);
+  int rv = dup(fileno(fp.get()));
+  PCHECK(rv != -1) << "dup";
+  return embedder::ScopedPlatformHandle(embedder::PlatformHandle(rv));
+}
+
+base::ScopedFILE FILEFromPlatformHandle(embedder::ScopedPlatformHandle h,
+                                        const char* mode) {
+  CHECK(h.is_valid());
+  base::ScopedFILE rv(fdopen(h.release().fd, mode));
+  PCHECK(rv) << "fdopen";
+  return rv.Pass();
+}
+
 base::FilePath GetFilePathForJSResource(const std::string& path) {
   std::string binding_path = "gen/" + path + ".js";
   base::FilePath exe_dir;