PreferencesManager

ash/common/shelf/shelf_controller.cc

Index: ash/common/shelf/shelf_controller.cc
diff --git a/ash/common/shelf/shelf_controller.cc b/ash/common/shelf/shelf_controller.cc
index 043fec9e7513655c295521b1b328c4b116ffe463..4c5fa7fb3ac049d257bb4c1143733ee9e20a1e90 100644
--- a/ash/common/shelf/shelf_controller.cc
+++ b/ash/common/shelf/shelf_controller.cc
@@ -7,11 +7,15 @@
 #include "ash/common/shelf/shelf_item_delegate.h"
 #include "ash/common/shelf/shelf_menu_model.h"
 #include "ash/common/shelf/wm_shelf.h"
+#include "ash/common/shell_delegate.h"
 #include "ash/common/wm_lookup.h"
 #include "ash/common/wm_root_window_controller.h"
 #include "ash/common/wm_shell.h"
 #include "ash/common/wm_window.h"
 #include "base/strings/utf_string_conversions.h"
+#include "services/preferences/public/cpp/pref_observer_store.h"
+#include "services/preferences/public/interfaces/preferences.mojom.h"
+#include "services/service_manager/public/cpp/connector.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
@@ -168,6 +172,20 @@ ShelfController::~ShelfController() {}
 
 void ShelfController::BindRequest(mojom::ShelfControllerRequest request) {
   bindings_.AddBinding(this, std::move(request));
+
+  // Sample of connecting to the PreferencesManager
+  WmShell* shell = WmShell::Get();
+  service_manager::Connector* connector =
+      shell->delegate()->GetShellConnector();
+  if (!connector)
+    return;
+  prefs::mojom::PreferencesManagerPtr pref_manager_ptr;
+  connector->ConnectToInterface("service:content_browser", &pref_manager_ptr);
+  store_ = new PrefObserverStore(std::move(pref_manager_ptr));
+  std::set<std::string> keys;
+  const std::string key("hey");
+  keys.insert(key);
+  store_->Init(keys);

[jonross, 2016/11/02 19:57:30]

Once this is connected it can be used as a normal PrefStore for accessing prefs.

I'm considering modifying PrefService to perform this init behind the scenes.

On the Ash side you can implement PrefStore::Observer to be notified of changes
to prefs. The PrefObserverStore above will trigger notifications to these
observers once chrome has sent the initial values.

 }
 
 void ShelfController::NotifyShelfCreated(WmShelf* shelf) {