Bug 835013 - AppProtocolHandler.js and related code taking ~50ms on the critical startup path r=cjones

dom/apps/src/AppsService.js

@@ -68,6 +68,11 @@ AppsService.prototype = {
     return DOMApplicationRegistry.getWebAppsBasePath();
   },
 
+  getAppInfo: function getAppInfo(aAppId) {
+    debug("getAppInfo()");
+    return DOMApplicationRegistry.getAppInfo(aAppId);
+  },
+
   classID : APPS_SERVICE_CID,
   QueryInterface : XPCOMUtils.generateQI([Ci.nsIAppsService])
 }

dom/apps/src/AppsServiceChild.jsm

@@ -111,7 +111,16 @@ this.DOMApplicationRegistry = {
   getWebAppsBasePath: function getWebAppsBasePath() {
     debug("getWebAppsBasePath() not yet supported on child!");
     return null;
-  }
+  },
+
+  getAppInfo: function getAppInfo(aAppId) {
+    if (!this.webapps[aAppId]) {
+      debug("No webapp for " + aAppId);
+      return null;
+    }
+    return { "basePath":  this.webapps[aAppId].basePath + "/",
+             "isCoreApp": !this.webapps[aAppId].removable };
+  },
 }
 
 DOMApplicationRegistry.init();

dom/apps/src/Webapps.jsm

@@ -75,7 +75,7 @@ this.DOMApplicationRegistry = {
                      "Webapps:GetSelf", "Webapps:CheckInstalled",
                      "Webapps:GetInstalled", "Webapps:GetNotInstalled",
                      "Webapps:Launch", "Webapps:GetAll",
-                     "Webapps:InstallPackage", "Webapps:GetAppInfo",
+                     "Webapps:InstallPackage",
                      "Webapps:GetList", "Webapps:RegisterForMessages",
                      "Webapps:UnregisterForMessages",
                      "Webapps:CancelDownload", "Webapps:CheckForUpdate",
@@ -798,14 +798,6 @@ this.DOMApplicationRegistry = {
       case "Webapps:InstallPackage":
         this.doInstallPackage(msg, mm);
         break;
-      case "Webapps:GetAppInfo":
-        if (!this.webapps[msg.id]) {
-          debug("No webapp for " + msg.id);
-          return null;
-        }
-        return { "basePath":  this.webapps[msg.id].basePath + "/",
-                 "isCoreApp": !this.webapps[msg.id].removable };
-        break;
       case "Webapps:RegisterForMessages":
         this.addMessageListener(msg, mm);
         break;
@@ -836,6 +828,15 @@ this.DOMApplicationRegistry = {
     }
   },
 
+  getAppInfo: function getAppInfo(aAppId) {
+    if (!this.webapps[aAppId]) {
+      debug("No webapp for " + aAppId);
+      return null;
+    }
+    return { "basePath":  this.webapps[aAppId].basePath + "/",
+             "isCoreApp": !this.webapps[aAppId].removable };
+  },
+
   // Some messages can be listened by several content processes:
   // Webapps:AddApp
   // Webapps:RemoveApp

dom/interfaces/apps/nsIAppsService.idl

@@ -16,7 +16,7 @@ interface mozIApplication;
  * This service allows accessing some DOMApplicationRegistry methods from
  * non-javascript code.
  */
-[scriptable, uuid(e65f9397-e191-4273-aa5f-f13c185ce63b)]
+[scriptable, uuid(4ac27836-4d79-4d35-b105-d6fb7f4f8e41)]
 interface nsIAppsService : nsISupports
 {
   mozIDOMApplication getAppByManifestURL(in DOMString manifestURL);
@@ -60,4 +60,6 @@ interface nsIAppsService : nsISupports
    * Returns the basepath for regular packaged apps
    */
   DOMString getWebAppsBasePath();
+
+  jsval getAppInfo(in DOMString appId);
 };

netwerk/protocol/app/AppProtocolHandler.js

@@ -11,9 +11,9 @@ const Cu = Components.utils;
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 
-XPCOMUtils.defineLazyServiceGetter(this, "cpmm",
-                                   "@mozilla.org/childprocessmessagemanager;1",
-                                   "nsISyncMessageSender");
+XPCOMUtils.defineLazyServiceGetter(this, "appsService",
+                                   "@mozilla.org/AppsService;1",
+                                   "nsIAppsService");
 
 function AppProtocolHandler() {
   this._appInfo = [];
@@ -36,8 +36,7 @@ AppProtocolHandler.prototype = {
   getAppInfo: function app_phGetAppInfo(aId) {
 
     if (!this._appInfo[aId]) {
-      let reply = cpmm.sendSyncMessage("Webapps:GetAppInfo", { id: aId });
-      this._appInfo[aId] = reply[0];
+      this._appInfo[aId] = appsService.getAppInfo(aId);
     }
     return this._appInfo[aId];
   },