[Download Notification] Show preview if downloaded file is image

chrome/common/chrome_utility_messages.h

Index: chrome/common/chrome_utility_messages.h
diff --git a/chrome/common/chrome_utility_messages.h b/chrome/common/chrome_utility_messages.h
index 76e7a1c6209d0ccebffa254d5f1f455ab4b50b0b..89c2e866a22d1066a67a3cc31328cdcdbe7757c6 100644
--- a/chrome/common/chrome_utility_messages.h
+++ b/chrome/common/chrome_utility_messages.h
@@ -135,6 +135,12 @@ IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_DecodeImage,
                      bool /* shrink image if needed for IPC msg limit */,
                      int /* delegate id */)
 
+// Tell the utility process to decode the given file.
+IPC_MESSAGE_CONTROL3(ChromeUtilityMsg_DecodeImageByHandle,
+                     IPC::PlatformFileForTransit /* image file */,
+                     bool /* shrink image if needed for IPC msg limit */,
+                     int /* delegate id */)
+
 #if defined(OS_CHROMEOS)
 // Tell the utility process to decode the given JPEG image data with a robust
 // libjpeg codec.