Increase kSyncOperationTimeout to let SyncFakeServerTest pass on slow lab machines

ios/chrome/browser/ui/sync/sync_fake_server_egtest.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <EarlGrey/EarlGrey.h>
 #import <XCTest/XCTest.h>
 
 #include "base/strings/sys_string_conversions.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/bookmarks/browser/titled_url_match.h"
@@ skipping 23 matching lines @@
 #import "ios/testing/wait_util.h"
 #import "ios/web/public/test/http_server.h"
 #import "ios/web/public/test/http_server_util.h"
 #import "net/base/mac/url_conversions.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "url/gurl.h"
 
 namespace {
 
 // Constant for timeout while waiting for asynchronous sync operations.
-const NSTimeInterval kSyncOperationTimeout = 5.0;
+const NSTimeInterval kSyncOperationTimeout = 10.0;
 
 // Returns a fake identity.
 ChromeIdentity* GetFakeIdentity1() {
   return [FakeChromeIdentity identityWithEmail:@"foo@gmail.com"
                                         gaiaID:@"fooID"
                                           name:@"Fake Foo"];
 }
 
 // Opens the signin screen from the settings page. Must be called from the NTP.
 // User must not be signed in.
@@ skipping 573 matching lines @@
 
   // Verify the correct number of bookmarks exist.
   base::string16 matchString = base::SysNSStringToUTF16(title);
   std::vector<bookmarks::TitledUrlMatch> matches;
   bookmarkModel->GetBookmarksMatching(matchString, 50, &matches);
   const size_t count = matches.size();
   GREYAssertEqual(expectedCount, count, @"Unexpected number of bookmarks");
 }
 
 @end