Linux native notifications: Add const variables for DBus strings.

chrome/browser/notifications/notification_platform_bridge_linux.cc

Index: chrome/browser/notifications/notification_platform_bridge_linux.cc
diff --git a/chrome/browser/notifications/notification_platform_bridge_linux.cc b/chrome/browser/notifications/notification_platform_bridge_linux.cc
index 702228e4183037e870e76388cb13b04836e8339c..602b7b3047963c747b8d7246f67cdb8750e763af 100644
--- a/chrome/browser/notifications/notification_platform_bridge_linux.cc
+++ b/chrome/browser/notifications/notification_platform_bridge_linux.cc
@@ -41,9 +41,33 @@
 
 namespace {
 
+// DBus name / path.
 const char kFreedesktopNotificationsName[] = "org.freedesktop.Notifications";
 const char kFreedesktopNotificationsPath[] = "/org/freedesktop/Notifications";
 
+// DBus methods.
+const char kMethodCloseNotification[] = "CloseNotification";
+const char kMethodGetCapabilities[] = "GetCapabilities";
+const char kMethodNotify[] = "Notify";
+const char kMethodGetServerInformation[] = "GetServerInformation";
+
+// DBus signals.
+const char kSignalActionInvoked[] = "ActionInvoked";
+const char kSignalNotificationClosed[] = "NotificationClosed";
+
+// Capabilities.
+const char kCapabilityActionIcons[] = "action-icons";
+const char kCapabilityActions[] = "actions";
+const char kCapabilityBody[] = "body";
+const char kCapabilityBodyHyperlinks[] = "body-hyperlinks";
+const char kCapabilityBodyImages[] = "body-images";
+const char kCapabilityBodyMarkup[] = "body-markup";
+const char kCapabilityIconMulti[] = "icon-multi";
+const char kCapabilityIconStatic[] = "icon-static";
+const char kCapabilityPersistence[] = "persistence";
+const char kCapabilitySound[] = "sound";
+
+// Button IDs.
 const char kDefaultButtonId[] = "default";
 const char kSettingsButtonId[] = "settings";
 
@@ -350,7 +374,7 @@ class NotificationPlatformBridgeLinuxImpl
     }
 
     dbus::MethodCall get_capabilities_call(kFreedesktopNotificationsName,
-                                           "GetCapabilities");
+                                           kMethodGetCapabilities);
     std::unique_ptr<dbus::Response> capabilities_response =
         notification_proxy_->CallMethodAndBlock(
             &get_capabilities_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT);
@@ -364,7 +388,7 @@ class NotificationPlatformBridgeLinuxImpl
     RecordMetricsForCapabilities();
 
     dbus::MethodCall get_server_information_call(kFreedesktopNotificationsName,
-                                                 "GetServerInformation");
+                                                 kMethodGetServerInformation);
     std::unique_ptr<dbus::Response> server_information_response =
         notification_proxy_->CallMethodAndBlock(
             &get_server_information_call,
@@ -392,12 +416,12 @@ class NotificationPlatformBridgeLinuxImpl
                           OnConnectionInitializationFinishedOnTaskRunner,
                       this, ConnectionInitializationStatusCode::SUCCESS));
     notification_proxy_->ConnectToSignal(
-        kFreedesktopNotificationsName, "ActionInvoked",
+        kFreedesktopNotificationsName, kSignalActionInvoked,
         base::Bind(&NotificationPlatformBridgeLinuxImpl::OnActionInvoked, this),
         base::Bind(&NotificationPlatformBridgeLinuxImpl::OnSignalConnected,
                    this));
     notification_proxy_->ConnectToSignal(
-        kFreedesktopNotificationsName, "NotificationClosed",
+        kFreedesktopNotificationsName, kSignalNotificationClosed,
         base::Bind(&NotificationPlatformBridgeLinuxImpl::OnNotificationClosed,
                    this),
         base::Bind(&NotificationPlatformBridgeLinuxImpl::OnSignalConnected,
@@ -434,7 +458,7 @@ class NotificationPlatformBridgeLinuxImpl
       notifications_.emplace(data, base::WrapUnique(data));
     }
 
-    dbus::MethodCall method_call(kFreedesktopNotificationsName, "Notify");
+    dbus::MethodCall method_call(kFreedesktopNotificationsName, kMethodNotify);
     dbus::MessageWriter writer(&method_call);
 
     // app_name passed implicitly via desktop-entry.
@@ -449,9 +473,9 @@ class NotificationPlatformBridgeLinuxImpl
         base::UTF16ToUTF8(CreateNotificationTitle(*notification)));
 
     std::string body;
-    if (base::ContainsKey(capabilities_, "body")) {
+    if (base::ContainsKey(capabilities_, kCapabilityBody)) {
       body = base::UTF16ToUTF8(notification->message());
-      if (base::ContainsKey(capabilities_, "body-markup")) {
+      if (base::ContainsKey(capabilities_, kCapabilityBodyMarkup)) {
         base::ReplaceSubstringsAfterOffset(&body, 0, "&", "&amp;");
         base::ReplaceSubstringsAfterOffset(&body, 0, "<", "&lt;");
         base::ReplaceSubstringsAfterOffset(&body, 0, ">", "&gt;");
@@ -462,7 +486,7 @@ class NotificationPlatformBridgeLinuxImpl
     // Even-indexed elements in this vector are action IDs passed back to
     // us in OnActionInvoked().  Odd-indexed ones contain the button text.
     std::vector<std::string> actions;
-    if (base::ContainsKey(capabilities_, "actions")) {
+    if (base::ContainsKey(capabilities_, kCapabilityActions)) {
       data->action_start = data->action_end;
       for (const auto& button_info : notification->buttons()) {
         // FDO notification buttons can contain either an icon or a label,
@@ -550,7 +574,7 @@ class NotificationPlatformBridgeLinuxImpl
       if (data->notification_id == notification_id &&
           data->profile_id == profile_id) {
         dbus::MethodCall method_call(kFreedesktopNotificationsName,
-                                     "CloseNotification");
+                                     kMethodCloseNotification);
         dbus::MessageWriter writer(&method_call);
         writer.AppendUint32(data->dbus_id);
         notification_proxy_->CallMethodAndBlock(
@@ -700,27 +724,33 @@ class NotificationPlatformBridgeLinuxImpl
   void RecordMetricsForCapabilities() {
     // Histogram macros must be called with the same name for each
     // callsite, so we can't roll the below into a nice loop.
-    UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.ActionIcons",
-                          base::ContainsKey(capabilities_, "action-icons"));
+    UMA_HISTOGRAM_BOOLEAN(
+        "Notifications.Freedesktop.Capabilities.ActionIcons",
+        base::ContainsKey(capabilities_, kCapabilityActionIcons));
     UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.Actions",
-                          base::ContainsKey(capabilities_, "actions"));
+                          base::ContainsKey(capabilities_, kCapabilityActions));
     UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.Body",
-                          base::ContainsKey(capabilities_, "body"));
+                          base::ContainsKey(capabilities_, kCapabilityBody));
     UMA_HISTOGRAM_BOOLEAN(
         "Notifications.Freedesktop.Capabilities.BodyHyperlinks",
-        base::ContainsKey(capabilities_, "body-hyperlinks"));
-    UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.BodyImages",
-                          base::ContainsKey(capabilities_, "body-images"));
-    UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.BodyMarkup",
-                          base::ContainsKey(capabilities_, "body-markup"));
-    UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.IconMulti",
-                          base::ContainsKey(capabilities_, "icon-multi"));
-    UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.IconStatic",
-                          base::ContainsKey(capabilities_, "icon-static"));
-    UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.Persistence",
-                          base::ContainsKey(capabilities_, "persistence"));
+        base::ContainsKey(capabilities_, kCapabilityBodyHyperlinks));
+    UMA_HISTOGRAM_BOOLEAN(
+        "Notifications.Freedesktop.Capabilities.BodyImages",
+        base::ContainsKey(capabilities_, kCapabilityBodyImages));
+    UMA_HISTOGRAM_BOOLEAN(
+        "Notifications.Freedesktop.Capabilities.BodyMarkup",
+        base::ContainsKey(capabilities_, kCapabilityBodyMarkup));
+    UMA_HISTOGRAM_BOOLEAN(
+        "Notifications.Freedesktop.Capabilities.IconMulti",
+        base::ContainsKey(capabilities_, kCapabilityIconMulti));
+    UMA_HISTOGRAM_BOOLEAN(
+        "Notifications.Freedesktop.Capabilities.IconStatic",
+        base::ContainsKey(capabilities_, kCapabilityIconStatic));
+    UMA_HISTOGRAM_BOOLEAN(
+        "Notifications.Freedesktop.Capabilities.Persistence",
+        base::ContainsKey(capabilities_, kCapabilityPersistence));
     UMA_HISTOGRAM_BOOLEAN("Notifications.Freedesktop.Capabilities.Sound",
-                          base::ContainsKey(capabilities_, "sound"));
+                          base::ContainsKey(capabilities_, kCapabilitySound));
   }
 
   //////////////////////////////////////////////////////////////////////////////