Add ContentSuggestionsService

components/ntp_snippets/content_suggestions_category_status.h

Index: components/ntp_snippets/content_suggestions_category_status.h
diff --git a/components/ntp_snippets/content_suggestions_category_status.h b/components/ntp_snippets/content_suggestions_category_status.h
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+++ b/components/ntp_snippets/content_suggestions_category_status.h
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+// 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.
+
+#ifndef COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_CATEGORY_STATUS_H_
+#define COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_CATEGORY_STATUS_H_
+
+namespace ntp_snippets {
+
+// Represents the status of a category of content suggestions.
+// On Android builds, a Java counterpart will be generated for this enum.
+// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.chrome.browser.ntp.snippets
+enum class ContentSuggestionsCategoryStatus {
+  // Content suggestions are available (though the list of available suggestions
+  // may be empty simply because there are no reasonable suggestions to be made
+  // at the moment).
+  AVAILABLE,
+  // Content suggestions are provided but not yet loaded.
+  AVAILABLE_LOADING,
+
+  // There is no provider that provides suggestions for this category.
+  NOT_PROVIDED,
+  // The entire content suggestions feature has explicitly been disabled as part
+  // of the service configuration.
+  ALL_SUGGESTIONS_EXPLICITLY_DISABLED,
+  // Content suggestions from a specific category have been disabled as part of
+  // the service configuration.
+  CATEGORY_EXPLICITLY_DISABLED,
+
+  // Content suggestions are not available because the user is not signed in.
+  SIGNED_OUT,
+  // Content suggestions are not available because sync is disabled.
+  SYNC_DISABLED,
+  // Content suggestions are not available because passphrase encryption is
+  // enabled (and it should be disabled).
+  PASSPHRASE_ENCRYPTION_ENABLED,
+  // Content suggestions are not available because history sync is disabled.
+  HISTORY_SYNC_DISABLED,
+  // Content suggestions are not available because the history sync service is
+  // not yet completely initialized and its status is unknown.
+  HISTORY_SYNC_STATE_UNKNOWN
+};
+
+// Determines whether the given status is one of the AVAILABLE statuses.
+bool IsContentSuggestionsCategoryStatusAvailable(
+    ContentSuggestionsCategoryStatus status);
+
+}  // namespace ntp_snippets
+
+#endif  // COMPONENTS_NTP_SNIPPETS_CONTENT_SUGGESTIONS_CATEGORY_STATUS_H_