Add ContentSuggestionsService

components/ntp_snippets/content_suggestion.cc

 // 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.
 
+#include "base/strings/stringprintf.h"

[Marc Treib, 2016/07/01 09:15:33]

This should go below the include for the content_suggestion.h header (with an
empty line between)

[Philipp Keck, 2016/07/01 13:00:04]

Done.

 #include "components/ntp_snippets/content_suggestion.h"
 
 namespace ntp_snippets {
 
+namespace {
+
+const char kCombinedIDFormat[] = "%d:%s";
+
+// Helper function to combine ID and provider_type into a common ID to make it
+// unique.
+std::string CombineID(ContentSuggestionsProviderType provider_type,
+                      const std::string& original_id) {
+  return base::StringPrintf(kCombinedIDFormat, provider_type,
+                            original_id.c_str());
+}
+
+}  // namespace
+
 ContentSuggestion::ContentSuggestion(
-    const std::string& id,
-    const ContentSuggestionsProviderType provider,
+    const std::string& original_id,
+    const ContentSuggestionsProviderType provider_type,
     const ContentSuggestionCategory category,
     const GURL& url)
-    : id_(id), provider_(provider), category_(category), url_(url), score_(0) {}
+    : id_(CombineID(provider_type, original_id)),
+      category_(category),
+      url_(url),
+      score_(0) {}
+
+ContentSuggestion::ContentSuggestion(ContentSuggestion&&) = default;
+
+ContentSuggestion& ContentSuggestion::operator=(ContentSuggestion&&) = default;
 
 ContentSuggestion::~ContentSuggestion() {}
 
 }  // namespace ntp_snippets