Fix PP_FileOpenFlags_Dev handling:

ppapi/tests/test_file_io.h

Index: ppapi/tests/test_file_io.h
diff --git a/ppapi/tests/test_file_io.h b/ppapi/tests/test_file_io.h
index 0140824443a533df87caf582d7a730cefe17fb31..2d6117f83a343d6cfa9e20df45a5b072183d204a 100644
--- a/ppapi/tests/test_file_io.h
+++ b/ppapi/tests/test_file_io.h
@@ -9,6 +9,10 @@
 
 #include "ppapi/tests/test_case.h"
 
+namespace pp {
+class FileSystem_Dev;
+}  // namespace pp
+
 class TestFileIO : public TestCase {
  public:
   explicit TestFileIO(TestingInstance* instance) : TestCase(instance) {}
@@ -18,10 +22,34 @@ class TestFileIO : public TestCase {
   virtual void RunTest();
 
  private:
+  enum OpenExpectation {
+    CREATE_IF_DOESNT_EXIST = 1 << 0,
+    DONT_CREATE_IF_DOESNT_EXIST = 1 << 1,
+    OPEN_IF_EXISTS = 1 << 2,
+    DONT_OPEN_IF_EXISTS = 1 << 3,
+    TRUNCATE_IF_EXISTS = 1 << 4,
+    DONT_TRUNCATE_IF_EXISTS = 1 << 5,
+    // All values above are defined in pairs: <some_expectation> and
+    // DONT_<some_expectation>.
+    END_OF_OPEN_EXPECATION_PAIRS = DONT_TRUNCATE_IF_EXISTS,
+
+    INVALID_FLAG_COMBINATION = 1 << 6,
+  };
+
   std::string TestOpen();
   std::string TestReadWriteSetLength();
   std::string TestTouchQuery();
   std::string TestAbortCalls();
+
+  // Helper method used by TestOpen().
+  // |expectations| is a combination of OpenExpectation values. The followings
+  // are considered as valid input:
+  // 1) INVALID_FLAG_COMBINATION
+  // 2) (DONT_)?CREATE_IF_DOESNT_EXIST | (DONT_)?OPEN_IF_EXISTS |
+  //    (DONT_)?TRUNCATE_IF_EXISTS
+  std::string MatchOpenExpectations(pp::FileSystem_Dev* file_system,
+                                    size_t open_flags,
+                                    size_t expectations);
 };
 
 #endif  // PAPPI_TESTS_TEST_FILE_IO_H_