Add a mojo struct corresponding and typemapped to base::File.

mojo/common/common_custom_types_unittest.cc

Index: mojo/common/common_custom_types_unittest.cc
diff --git a/mojo/common/common_custom_types_unittest.cc b/mojo/common/common_custom_types_unittest.cc
index 520f82a9a005028c8b79217b80382dd28e9c4d3a..b2886775c61338fe3a017af34857460626d4d296 100644
--- a/mojo/common/common_custom_types_unittest.cc
+++ b/mojo/common/common_custom_types_unittest.cc
@@ -3,7 +3,9 @@
 // found in the LICENSE file.
 
 #include "base/files/file_path.h"
+#include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
+#include "base/numerics/safe_math.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
@@ -164,6 +166,20 @@ class TestString16Impl : public TestString16 {
   mojo::Binding<TestString16> binding_;
 };
 
+class TestFileImpl : public TestFile {
+ public:
+  explicit TestFileImpl(TestFileRequest request)
+      : binding_(this, std::move(request)) {}
+
+  // TestFile implementation:
+  void BounceFile(base::File in, const BounceFileCallback& callback) override {
+    callback.Run(std::move(in));
+  }
+
+ private:
+  mojo::Binding<TestFile> binding_;
+};
+
 class CommonCustomTypesTest : public testing::Test {
  protected:
   CommonCustomTypesTest() {}
@@ -311,6 +327,49 @@ TEST_F(CommonCustomTypesTest, EmptyString16) {
   run_loop.Run();
 }
 
+TEST_F(CommonCustomTypesTest, File) {
+  base::ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+
+  TestFilePtr ptr;
+  TestFileImpl impl(GetProxy(&ptr));
+
+  base::File file(
+      temp_dir.GetPath().AppendASCII("test_file.txt"),
+      base::File::FLAG_CREATE | base::File::FLAG_WRITE | base::File::FLAG_READ);
+  const base::StringPiece test_content =
+      "A test string to be stored in a test file";
+  file.WriteAtCurrentPos(
+      test_content.data(),
+      base::CheckedNumeric<int>(test_content.size()).ValueOrDie());
+
+  base::File file_out;
+  ASSERT_TRUE(ptr->BounceFile(std::move(file), &file_out));
+  std::vector<char> content(test_content.size());
+  ASSERT_TRUE(file_out.IsValid());
+  ASSERT_EQ(static_cast<int>(test_content.size()),
+            file_out.Read(
+                0, content.data(),
+                base::CheckedNumeric<int>(test_content.size()).ValueOrDie()));
+  EXPECT_EQ(test_content,
+            base::StringPiece(content.data(), test_content.size()));
+}
+
+TEST_F(CommonCustomTypesTest, InvalidFile) {
+  TestFilePtr ptr;
+  TestFileImpl impl(GetProxy(&ptr));
+
+  base::ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+  // Test that |file_out| is set to an invalid file.
+  base::File file_out(
+      temp_dir.GetPath().AppendASCII("test_file.txt"),
+      base::File::FLAG_CREATE | base::File::FLAG_WRITE | base::File::FLAG_READ);
+
+  ASSERT_TRUE(ptr->BounceFile(base::File(), &file_out));
+  EXPECT_FALSE(file_out.IsValid());
+}
+
 }  // namespace test
 }  // namespace common
 }  // namespace mojo