diff --git a/build/tasks/testswarm.js b/build/tasks/testswarm.js
@@ -0,0 +1,50 @@
+module.exports = function( grunt ) {
+
+	"use strict";
+
+	grunt.registerTask( "testswarm", function( commit, configFile ) {
+		var jobName,
+			testswarm = require( "testswarm" ),
+			runs = {},
+			done = this.async(),
+			pull = /PR-(\d+)/.exec( commit ),
+			config = grunt.file.readJSON( configFile ).jquery,
+			tests = grunt.config([ this.name, "tests" ]);
+
+		if ( pull ) {
+			jobName = "jQuery pull <a href='https://github.com/jquery/jquery/pull/" +
+				pull[ 1 ] + "'>#" + pull[ 1 ] + "</a>";
+		} else {
+			jobName = "jQuery commit #<a href='https://github.com/jquery/jquery/commit/" +
+				commit + "'>" + commit.substr( 0, 10 ) + "</a>";
+		}
+
+		tests.forEach(function( test ) {
+			runs[ test ] = config.testUrl + commit + "/test/index.html?module=" + test;
+		});
+
+		testswarm.createClient( {
+			url: config.swarmUrl,
+			pollInterval: 10000,
+			timeout: 1000 * 60 * 30
+		} )
+		.addReporter( testswarm.reporters.cli )
+		.auth( {
+			id: config.authUsername,
+			token: config.authToken
+		})
+		.addjob(
+			{
+				name: jobName,
+				runs: runs,
+				runMax: config.runMax,
+				browserSets: config.browserSets
+			}, function( err, passed ) {
+				if ( err ) {
+					grunt.log.error( err );
+				}
+				done( passed );
+			}
+		);
+	});
+};
diff --git a/build/tasks/uglify.js b/build/tasks/uglify.js
@@ -0,0 +1,54 @@
+module.exports = function( grunt ) {
+
+	"use strict";
+
+	var fs = require( "fs" );
+
+	// Work around grunt-contrib-uglify sourceMap issues (jQuery #13776)
+	grunt.registerMultiTask( "pre-uglify", function() {
+		var banner = this.options().banner;
+
+		this.files.forEach(function( mapping ) {
+			// Join src
+			var input = mapping.src.map(function( file ) {
+				var contents = grunt.file.read( file );
+
+				// Strip banners
+				return contents
+					// Remove the main jQuery banner, it'll be replaced by the new banner anyway.
+					.replace( /^\/\*![\W\w]*?\*\/\n?/g, "" )
+					// Strip other banners preserving line count.
+					.replace( /^\/\*!(?:.|\n)*?\*\/\n?/gm, function ( match ) {
+						return match.replace( /[^\n]/gm, "" );
+					});
+			}).join("\n");
+
+			// Write temp file (with optional banner)
+			grunt.file.write( mapping.dest, ( banner || "" ) + input );
+		});
+	});
+
+	// Change the map file to point back to jquery.js instead of jquery.pre-min.js.
+	// The problem is caused by the pre-uglify task.
+	// Also, remove temporary files.
+	grunt.registerMultiTask( "post-uglify", function() {
+		this.files.forEach(function( mapping ) {
+			var mapFileName = mapping.src[ 0 ];
+
+			// Rename the file to a temporary name.
+			fs.renameSync( mapFileName, mapping.dest);
+			grunt.file.write( mapFileName, grunt.file.read( mapping.dest )
+				// The uglify task erroneously prepends dist/ to file names.
+				.replace( /"dist\//g, "\"" )
+				// Refer to the source jquery.js, not the temporary jquery.pre-min.js.
+				.replace( /\.pre-min\./g, "." )
+				// There's already a pragma at the beginning of the file, remove the one at the end.
+				.replace( /\/\/@ sourceMappingURL=jquery\.min\.map$/g, "" ));
+		});
+
+		// Remove temporary files.
+		this.options().tempFiles.forEach(function( fileName ) {
+			fs.unlink( fileName );
+		});
+	});
+};