Update from https://crrev.com/327068

testing/android/junit/java/src/org/chromium/testing/local/RobolectricClasspathDependencyResolver.java

Index: testing/android/junit/java/src/org/chromium/testing/local/RobolectricClasspathDependencyResolver.java
diff --git a/testing/android/junit/java/src/org/chromium/testing/local/RobolectricClasspathDependencyResolver.java b/testing/android/junit/java/src/org/chromium/testing/local/RobolectricClasspathDependencyResolver.java
new file mode 100644
index 0000000000000000000000000000000000000000..47bc1ba0dd5e4045f0bafe7a5a35c410c099cd8d
--- /dev/null
+++ b/testing/android/junit/java/src/org/chromium/testing/local/RobolectricClasspathDependencyResolver.java
@@ -0,0 +1,72 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.testing.local;
+
+import org.robolectric.DependencyJar;
+import org.robolectric.DependencyResolver;
+
+import java.io.File;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.regex.Pattern;
+
+/**
+ * A Robolectric dependency resolver that looks for the Robolectric dependencies
+ * in the Java classpath.
+ */
+public class RobolectricClasspathDependencyResolver implements DependencyResolver {
+    private static final Pattern COLON = Pattern.compile(":");
+    private final String[] mClassPathJars;
+
+    /**
+     * Creates a {@link ClasspathDependencyResolver}.
+     */
+    public RobolectricClasspathDependencyResolver() {
+        mClassPathJars = COLON.split(System.getProperty("java.class.path"));
+    }
+
+    /**
+     * Returns the {@link URL} for a Robolectric dependency. It looks through the jars
+     * in the classpath to find the dependency's filepath.
+     */
+    @Override
+    public URL getLocalArtifactUrl(DependencyJar dependency) {
+        // Jar filenames are constructed identically to how they are built in Robolectric's
+        // own LocalDependencyResolver.
+        String dependencyJar = dependency.getArtifactId() + "-" + dependency.getVersion() + "."
+                + dependency.getType();
+
+        for (String jarPath : mClassPathJars) {
+            if (jarPath.endsWith(dependencyJar)) {
+                return fileToUrl(new File(jarPath));
+            }
+        }
+        throw new IllegalStateException(
+                String.format("Robolectric jar %s was not found in classpath.", dependencyJar));
+    }
+
+    /**
+     * Returns the {@link URL} for a list of Robolectric dependencies.
+     */
+    @Override
+    public URL[] getLocalArtifactUrls(DependencyJar... dependencies) {
+        URL[] urls = new URL[dependencies.length];
+
+        for (int i = 0; i < dependencies.length; i++) {
+            urls[i] = getLocalArtifactUrl(dependencies[i]);
+        }
+
+        return urls;
+    }
+
+    private static URL fileToUrl(File file) {
+        try {
+            return file.toURI().toURL();
+        } catch (MalformedURLException e) {
+            throw new IllegalArgumentException(
+                    String.format("File \"%s\" cannot be represented as a URL: %s", file, e));
+        }
+    }
+}