Added RCTDataRequestHandler

Summary: public

Added RCTDataRequestHandler, which is responsible for loading data URLs. This moves the logic for data URL handling out of RCTImageDownloader (no longer needed) and into the RCTNetwork library, where it makes more sense.

This also means that it is now possible to load data URLs via XHR, and use them for purposes other than just images.

Reviewed By: javache

Differential Revision: D2540964

fb-gh-sync-id: 4f0418bd6b9186f047cc8297276bb970795af104

Libraries/Network/RCTFileRequestHandler.m

@@ -11,13 +11,13 @@
 
 #import <MobileCoreServices/MobileCoreServices.h>
 
+#import "RCTUtils.h"
+
 @implementation RCTFileRequestHandler
 {
   NSOperationQueue *_fileQueue;
 }
 
-@synthesize methodQueue = _methodQueue;
-
 RCT_EXPORT_MODULE()
 
 - (void)invalidate
@@ -28,7 +28,9 @@ RCT_EXPORT_MODULE()
 
 - (BOOL)canHandleRequest:(NSURLRequest *)request
 {
-  return [request.URL.scheme caseInsensitiveCompare:@"file"] == NSOrderedSame;
+  return
+  [request.URL.scheme caseInsensitiveCompare:@"file"] == NSOrderedSame
+  && !RCTIsXCAssetURL(request.URL);
 }
 
 - (NSOperation *)sendRequest:(NSURLRequest *)request