Add HTMLKit Parser Performance test

This tests measures the parsing time of the HTML Living Standard page, about 8.1MB in
size (as of 23 October 2014)

HTMLKitTests/HTMLKitParserPerformance.m

@@ -0,0 +1,31 @@
+//
+//  HTMLKitParserPerformance.m
+//  HTMLKit
+//
+//  Created by Iska on 11/04/15.
+//  Copyright (c) 2015 BrainCookie. All rights reserved.
+//
+
+#import <XCTest/XCTest.h>
+#import "HTMLParser.h"
+
+@interface HTMLKitParserPerformance : XCTestCase
+
+@end
+
+@implementation HTMLKitParserPerformance
+
+- (void)testParserPerformance
+{
+	NSString *path = [[NSBundle bundleForClass:self.class] resourcePath];
+	path = [path stringByAppendingPathComponent:@"HTML Standard.html"];
+
+	NSString *string = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
+
+	[self measureBlock:^{
+		HTMLParser *parser = [[HTMLParser alloc] initWithString:string];
+		[parser parseDocument];
+	}];
+}
+
+@end