arc: Use the MIME type returned by the container to handle content URLs

chrome/browser/chromeos/arc/fileapi/arc_content_file_system_file_stream_reader_unittest.cc

 // Copyright 2016 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.
 
 #include <string.h>
 
 #include <memory>
 #include <string>
 #include <utility>
 
@@ skipping 18 matching lines @@
 namespace {
 
 // URL which returns a file descriptor of a regular file.
 constexpr char kArcUrlFile[] = "content://org.chromium.foo/file";
 
 // URL which returns a file descriptor of a pipe's read end.
 constexpr char kArcUrlPipe[] = "content://org.chromium.foo/pipe";
 
 constexpr char kData[] = "abcdefghijklmnopqrstuvwxyz";
 
+constexpr char kMimeType[] = "application/octet-stream";
+
 // Reads data from the reader to fill the buffer.
 bool ReadData(ArcContentFileSystemFileStreamReader* reader,
               net::IOBufferWithSize* buffer) {
   auto drainable_buffer =
       make_scoped_refptr(new net::DrainableIOBuffer(buffer, buffer->size()));
   while (drainable_buffer->BytesRemaining()) {
     net::TestCompletionCallback callback;
     int result = callback.GetResult(
         reader->Read(drainable_buffer.get(), drainable_buffer->BytesRemaining(),
                      callback.callback()));
     if (result < 0) {
       LOG(ERROR) << "Read failed: " << result;
       return false;
     }
     drainable_buffer->DidConsume(result);
   }
   return true;
 }
 
 class ArcContentFileSystemFileStreamReaderTest : public testing::Test {
  public:
   ArcContentFileSystemFileStreamReaderTest() = default;
 
   ~ArcContentFileSystemFileStreamReaderTest() override = default;
 
   void SetUp() override {
-    fake_file_system_.AddFile(File(kArcUrlFile, kData, File::Seekable::YES));
-    fake_file_system_.AddFile(File(kArcUrlPipe, kData, File::Seekable::NO));
+    fake_file_system_.AddFile(
+        File(kArcUrlFile, kData, kMimeType, File::Seekable::YES));
+    fake_file_system_.AddFile(
+        File(kArcUrlPipe, kData, kMimeType, File::Seekable::NO));
 
     arc_service_manager_ = base::MakeUnique<ArcServiceManager>(nullptr);
     arc_service_manager_->AddService(
         ArcFileSystemOperationRunner::CreateForTesting(
             arc_service_manager_->arc_bridge_service()));
     arc_service_manager_->arc_bridge_service()->file_system()->SetInstance(
         &fake_file_system_);
   }
 
  private:
@@ skipping 44 matching lines @@
 
 TEST_F(ArcContentFileSystemFileStreamReaderTest, GetLength) {
   ArcContentFileSystemFileStreamReader reader(GURL(kArcUrlFile), 0);
 
   net::TestInt64CompletionCallback callback;
   EXPECT_EQ(static_cast<int64_t>(strlen(kData)),
             callback.GetResult(reader.GetLength(callback.callback())));
 }
 
 }  // namespace arc