Add a pref name for share targets, and store their manifest data.

chrome/browser/webshare/share_target_pref_helper.cc

Index: chrome/browser/webshare/share_target_pref_helper.cc
diff --git a/chrome/browser/webshare/share_target_pref_helper.cc b/chrome/browser/webshare/share_target_pref_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..66df8e6bb58646f783dc859b873f52ac68c89d62
--- /dev/null
+++ b/chrome/browser/webshare/share_target_pref_helper.cc
@@ -0,0 +1,39 @@
+// Copyright 2017 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.
+
+#include "chrome/browser/webshare/share_target_pref_helper.h"
+
+#include <sstream>

[Matt Giuca, 2017/01/24 03:26:09]

No more sstream.

[constantina, 2017/01/24 23:39:04]

Done.

+
+#include "chrome/common/pref_names.h"
+#include "components/prefs/pref_service.h"
+#include "components/prefs/scoped_user_pref_update.h"
+#include "content/public/common/manifest.h"
+
+namespace webshare {
+
+void AddShareTargetToPrefs(base::StringPiece share_target_origin,
+                           base::Optional<std::string> url_template,
+                           PrefService* pref_service) {
+  DictionaryPrefUpdate update(pref_service, prefs::kWebShareVisitedTargets);
+  base::DictionaryValue* share_target_dict = update.Get();
+
+  if (!url_template.has_value()) {
+    if (share_target_dict->HasKey(share_target_origin))
+      share_target_dict->RemoveWithoutPathExpansion(share_target_origin, NULL);

[Matt Giuca, 2017/01/24 03:26:09]

Does this need a check at all? If the key is missing, and you call
RemoveWithoutPathExpansion, will it just do nothing (which is what you want)? If
so, remove the check as it is redundant.

[constantina, 2017/01/24 23:39:04]

Yeah, it does nothing. Deleted.

+    return;
+  }
+
+  constexpr char kUrlTemplateKey[] = "url_template";
+
+  std::unique_ptr<base::DictionaryValue> origin_dict(new base::DictionaryValue);
+
+  origin_dict->SetStringWithoutPathExpansion(kUrlTemplateKey,
+                                             url_template.value());
+
+  share_target_dict->SetWithoutPathExpansion(share_target_origin,
+                                             std::move(origin_dict));
+}
+
+}  // namespace webshare