[iOS] Use default scheme for copied URLs without schemes

The iOS async clipboard APIs |detectPatternsForPatterns:| and
|detectValuesForPatterns:| return YES and a value even if the copied
data is a text url with no scheme. In this case, default to https when
constructing a URL/GURL.

Bug: 1306773
Change-Id: I649fa194a10a2ffc945335ba01d397744a3d2690
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3540620
Reviewed-by: Olivier Robin <[email protected]>
Commit-Queue: Robbie Gibson <[email protected]>
Cr-Commit-Position: refs/heads/main@{#983451}

components/open_from_clipboard/clipboard_recent_content_impl_ios.mm

@@ -28,6 +28,8 @@
 // Key used to store the last date at which it was detected that the pasteboard
 // changed. It is used to evaluate the age of the pasteboard's content.
 NSString* const kPasteboardChangeDateKey = @"PasteboardChangeDate";
+// Default Scheme to use for urls with no scheme.
+NSString* const kDefaultScheme = @"https";
 
 }  // namespace
 
@@ -392,6 +394,16 @@ - (void)recentURLFromClipboardAsync:(void (^)(NSURL*))callback {
                     URLWithString:
                         values[UIPasteboardDetectionPatternProbableWebURL]];
 
+                // |detectValuesForPatterns:| will return a url even if the url
+                // is missing a scheme. In this case, default to https.
+                if (url.scheme == nil) {
+                  NSURLComponents* components =
+                      [[NSURLComponents alloc] initWithURL:url
+                                   resolvingAgainstBaseURL:NO];
+                  components.scheme = kDefaultScheme;
+                  url = components.URL;
+                }
+
                 if (![self.authorizedSchemes containsObject:url.scheme]) {
                   weakSelf.cachedURL = nil;
                   callback(nil);