(Reland) Expose resources in Robolectric/JUnit tests.

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

Index: testing/android/junit/java/src/org/chromium/testing/local/LocalRobolectricTestRunner.java
diff --git a/testing/android/junit/java/src/org/chromium/testing/local/LocalRobolectricTestRunner.java b/testing/android/junit/java/src/org/chromium/testing/local/LocalRobolectricTestRunner.java
index ae72114f37ab032cedaac73d8f4c3798333876d7..7b2e28e971c768dd973935b1bf8bb137085ef1c7 100644
--- a/testing/android/junit/java/src/org/chromium/testing/local/LocalRobolectricTestRunner.java
+++ b/testing/android/junit/java/src/org/chromium/testing/local/LocalRobolectricTestRunner.java
@@ -14,6 +14,7 @@ import org.robolectric.internal.ManifestFactory;
  */
 public class LocalRobolectricTestRunner extends RobolectricTestRunner {
     private static final int DEFAULT_SDK = 25;
+    private static final String DEFAULT_PACKAGE_NAME = "org.robolectric.default";
 
     public LocalRobolectricTestRunner(Class<?> testClass) throws InitializationError {
         super(testClass);
@@ -21,7 +22,10 @@ public class LocalRobolectricTestRunner extends RobolectricTestRunner {
 
     @Override
     protected Config buildGlobalConfig() {
-        return new Config.Builder().setSdk(DEFAULT_SDK).build();
+        String packageName =
+                System.getProperty("chromium.robolectric.package.name", DEFAULT_PACKAGE_NAME);
+
+        return new Config.Builder().setSdk(DEFAULT_SDK).setPackageName(packageName).build();
     }
 
     @Override