[FileSystem] Add another copy-or-move validation hook for post-write.

chrome/browser/media_galleries/fileapi/supported_image_type_validator.cc

Index: chrome/browser/media_galleries/fileapi/supported_image_type_validator.cc
diff --git a/chrome/browser/media_galleries/fileapi/supported_image_type_validator.cc b/chrome/browser/media_galleries/fileapi/supported_image_type_validator.cc
index 00c601d8644ccc9ea2abcac68cce3def5925de1d..466b5f99d2cec4119df80c72162679da3e7cb3a7 100644
--- a/chrome/browser/media_galleries/fileapi/supported_image_type_validator.cc
+++ b/chrome/browser/media_galleries/fileapi/supported_image_type_validator.cc
@@ -111,8 +111,8 @@ bool SupportedImageTypeValidator::SupportsFileType(const base::FilePath& path) {
          extension == FILE_PATH_LITERAL(".webp");
 }
 
-void SupportedImageTypeValidator::StartValidation(
-    const fileapi::CopyOrMoveFileValidator::ResultCallback& result_callback) {
+void SupportedImageTypeValidator::StartPreWriteValidation(
+    const ResultCallback& result_callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(callback_.is_null());
   callback_ = result_callback;
@@ -125,6 +125,19 @@ void SupportedImageTypeValidator::StartValidation(
                  weak_factory_.GetWeakPtr()));
 }
 
+void SupportedImageTypeValidator::StartPostWriteValidation(
+    const base::FilePath& dest_platform_path,
+    const ResultCallback& result_callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  post_write_callback_ = result_callback;
+
+  // TODO(gbillock): Insert AV call here in the right validator.
+  BrowserThread::PostTask(
+      BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(post_write_callback_, base::PLATFORM_FILE_OK));
+}
+
 SupportedImageTypeValidator::SupportedImageTypeValidator(
     const base::FilePath& path)
     : path_(path),