Add a callback mechanism for resource extraction completion on Android.

content/public/android/javatests/src/org/chromium/content/browser/BrowserStartupControllerTest.java

Index: content/public/android/javatests/src/org/chromium/content/browser/BrowserStartupControllerTest.java
diff --git a/content/public/android/javatests/src/org/chromium/content/browser/BrowserStartupControllerTest.java b/content/public/android/javatests/src/org/chromium/content/browser/BrowserStartupControllerTest.java
index 2146d6850998d50591f0059d9dd091e6e568f43a..927f76a9b5d692d0fcbfea73b80b6dcee276fa1f 100644
--- a/content/public/android/javatests/src/org/chromium/content/browser/BrowserStartupControllerTest.java
+++ b/content/public/android/javatests/src/org/chromium/content/browser/BrowserStartupControllerTest.java
@@ -28,10 +28,13 @@ public class BrowserStartupControllerTest extends InstrumentationTestCase {
         private int mInitializedCounter = 0;
 
         @Override
-        void prepareToStartBrowserProcess(boolean singleProcess) throws ProcessInitException {
+        void prepareToStartBrowserProcess(boolean singleProcess, Runnable completionCallback)
+                throws ProcessInitException {
             if (!mLibraryLoadSucceeds) {
                 throw new ProcessInitException(
                         LoaderErrors.LOADER_ERROR_NATIVE_LIBRARY_LOAD_FAILED);
+            } else if (completionCallback != null) {
+                completionCallback.run();
             }
         }