Improve XmlDependencies.IsDependenciesFile performance

This simpler string manipulation checks the same logic as before but much faster in the context of a large project. If the OnPostprocessAllAssets callback is invoked multiple times with thousands of files, as can happen with non-trivial Unity projects, the regex call becomes quite expensive.

For profiling data see: googlesamples#601

Author: chrisyarbrough

source/AndroidResolver/src/XmlDependencies.cs

@@ -46,13 +46,9 @@ internal class XmlDependencies {
         /// </summary>
         /// <param name="filename"></param>
         /// <returns>true if it is a match, false otherwise.</returns>
-        internal bool IsDependenciesFile(string filename) {
-            foreach (var regex in fileRegularExpressions) {
-                if (regex.Match(filename).Success) {
-                    return true;
-                }
-            }
-            return false;
+        internal static bool IsDependenciesFile(string filename) {
+            bool isInEditorFolder = filename.Contains("/Editor/") || filename.Contains(@"\Editor\");
+            return isInEditorFolder && filename.EndsWith("Dependencies.xml");
         }
 
         /// <summary>

source/AndroidResolverTests/XmlDependenciesTests.cs

@@ -16,9 +16,8 @@ public class XmlDependenciesTests
 		[TestCase("Assets/MyEditorCode/SomeDependencies.xml")]
 		[TestCase("Assets/Editor/")]
 		[TestCase("Assets/Editor/Dependendencies")]
-		public void Test1(string path) {
-			var dependencies = new XmlDependencies();
-			bool actualResult = dependencies.IsDependenciesFile(path);
+		public void IsDependenciesFileReturnsExpected(string path) {
+			bool actualResult = XmlDependencies.IsDependenciesFile(path);
 
 			// This logic was part of the previous unoptimized implementation and can act as a test reference.
 			bool expectedResult = Regex.IsMatch(input: path, pattern: @".*[/\\]Editor[/\\].*Dependencies\.xml$");