[NativeFS] Change hash calculation code to go through FS backends.

This makes sure this code works for non-native file systems.

Bug: 1103076
Change-Id: I1579fd33cd40b6527504a89987ba8dbc9b3c8931
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304958
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791250}

content/browser/native_file_system/native_file_system_file_writer_impl.h

@@ -85,14 +85,16 @@ class CONTENT_EXPORT NativeFileSystemFileWriterImpl
   // perform cleanup even if the writer was deleted before they were invoked.
   static void DoAfterWriteCheck(
       base::WeakPtr<NativeFileSystemFileWriterImpl> file_writer,
-      const base::FilePath& swap_path,
+      scoped_refptr<NativeFileSystemManagerImpl> manager,
+      const storage::FileSystemURL& swap_url,
       NativeFileSystemFileWriterImpl::CloseCallback callback,
       base::File::Error hash_result,
       const std::string& hash,
       int64_t size);
   static void DidAfterWriteCheck(
       base::WeakPtr<NativeFileSystemFileWriterImpl> file_writer,
-      const base::FilePath& swap_path,
+      scoped_refptr<NativeFileSystemManagerImpl> manager,
+      const storage::FileSystemURL& swap_url,
       NativeFileSystemFileWriterImpl::CloseCallback callback,
       NativeFileSystemPermissionContext::AfterWriteCheckResult result);
   void DidPassAfterWriteCheck(CloseCallback callback);
@@ -106,8 +108,7 @@ class CONTENT_EXPORT NativeFileSystemFileWriterImpl
   // except temporary file systems.
   // TOOD(crbug.com/1103076): Extend this check to non-native paths.
   bool RequireSecurityChecks() const {
-    return url().type() == storage::kFileSystemTypeNativeLocal ||
-           url().type() == storage::kFileSystemTypeNativeForPlatformApp;
+    return url().type() != storage::kFileSystemTypeTemporary;
   }
 
   void ComputeHashForSwapFile(HashCallback callback);

content/browser/native_file_system/native_file_system_manager_impl_unittest.cc

@@ -290,8 +290,7 @@ TEST_F(NativeFileSystemManagerImplTest,
       storage::AsyncFileTestHelper::kDontCheckSize));
 }
 
-TEST_F(NativeFileSystemManagerImplTest,
-       FileWriterCloseAllowedToCompleteOnDestruct) {
+TEST_F(NativeFileSystemManagerImplTest, FileWriterCloseAbortsOnDestruct) {
   auto test_file_url = file_system_context_->CreateCrackedFileSystemURL(
       kTestOrigin, storage::kFileSystemTypeTest,
       base::FilePath::FromUTF8Unsafe("test"));
@@ -319,11 +318,14 @@ TEST_F(NativeFileSystemManagerImplTest,
   writer_remote.reset();
   base::RunLoop().RunUntilIdle();
 
+  // Since the writer was destroyed before close completed, the swap file should
+  // have been destroyed and the target file should have been left untouched.
   ASSERT_FALSE(storage::AsyncFileTestHelper::FileExists(
       file_system_context_.get(), test_swap_url,
       storage::AsyncFileTestHelper::kDontCheckSize));
-  ASSERT_TRUE(storage::AsyncFileTestHelper::FileExists(
-      file_system_context_.get(), test_file_url, 3));
+  ASSERT_FALSE(storage::AsyncFileTestHelper::FileExists(
+      file_system_context_.get(), test_file_url,
+      storage::AsyncFileTestHelper::kDontCheckSize));
 }
 
 TEST_F(NativeFileSystemManagerImplTest, SerializeHandle_SandboxedFile) {