Add API to set render process preferences

atom/browser/render_process_preferences.cc

@@ -0,0 +1,63 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/render_process_preferences.h"
+
+#include "atom/common/api/api_messages.h"
+#include "content/public/browser/notification_service.h"
+#include "content/public/browser/notification_types.h"
+#include "content/public/browser/render_process_host.h"
+
+namespace atom {
+
+RenderProcessPreferences::RenderProcessPreferences(const Predicate& predicate)
+    : predicate_(predicate),
+      next_id_(0),
+      cache_needs_update_(true) {
+  registrar_.Add(this,
+                 content::NOTIFICATION_RENDERER_PROCESS_CREATED,
+                 content::NotificationService::AllBrowserContextsAndSources());
+}
+
+RenderProcessPreferences::~RenderProcessPreferences() {
+}
+
+int RenderProcessPreferences::AddEntry(const base::DictionaryValue& entry) {
+  int id = ++next_id_;
+  entries_[id] = entry.CreateDeepCopy();
+  cache_needs_update_ = true;
+  return id;
+}
+
+void RenderProcessPreferences::RemoveEntry(int id) {
+  cache_needs_update_ = true;
+  entries_.erase(id);
+}
+
+void RenderProcessPreferences::Observe(
+    int type,
+    const content::NotificationSource& source,
+    const content::NotificationDetails& details) {
+  DCHECK_EQ(type, content::NOTIFICATION_RENDERER_PROCESS_CREATED);
+  content::RenderProcessHost* process =
+      content::Source<content::RenderProcessHost>(source).ptr();
+
+  if (!predicate_.Run(process))
+    return;
+
+  UpdateCache();
+  process->Send(new AtomMsg_UpdatePreferences(cached_entries_));
+}
+
+void RenderProcessPreferences::UpdateCache() {
+  if (!cache_needs_update_)
+    return;
+
+  cached_entries_.Clear();
+  for (const auto& iter : entries_)
+    cached_entries_.Append(iter.second->CreateDeepCopy());
+  cache_needs_update_ = false;
+}
+
+}  // namespace atom