Use Sync FakeServer in Android tests via custom APK

chrome/android/sync_shell/javatests/src/chromium/chrome/browser/sync/FakeServerHelper.java

Index: chrome/android/sync_shell/javatests/src/chromium/chrome/browser/sync/FakeServerHelper.java
diff --git a/chrome/android/sync_shell/javatests/src/chromium/chrome/browser/sync/FakeServerHelper.java b/chrome/android/sync_shell/javatests/src/chromium/chrome/browser/sync/FakeServerHelper.java
new file mode 100644
index 0000000000000000000000000000000000000000..09a25ce673c06ba2aed6e30c9c8b9fcad538a497
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+++ b/chrome/android/sync_shell/javatests/src/chromium/chrome/browser/sync/FakeServerHelper.java
@@ -0,0 +1,123 @@
+// Copyright 2014 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.chrome.browser.sync;
+
+import android.content.Context;
+
+import org.chromium.base.ThreadUtils;
+//import org.chromium.chrome.browser.sync.ProfileSyncService;
+
+import java.util.concurrent.Callable;
+
+/**
+ * Assists in Java interaction the native Sync FakeServer.
+ */
+public class FakeServerHelper {
+    // Lazily-instantiated singleton FakeServerHelper.
+    private static FakeServerHelper sFakeServerHelper;
+
+    // Pointer value for the FakeServer. This pointer is not owned by native
+    // code, so it must be stored here for future deletion.
+    private static long sNativeFakeServer = 0L;
+
+    // The pointer to the native object called here.
+    private final long mNativeFakeServerHelperAndroid;
+
+    // Accesses the singleton FakeServerHelper. There is at most one instance created per
+    // application lifetime, so no deletion mechanism is provided for the native object.
+    public static FakeServerHelper get() {
+        ThreadUtils.assertOnUiThread();
+        if (sFakeServerHelper == null) {
+            sFakeServerHelper = new FakeServerHelper();
+        }
+        return sFakeServerHelper;
+    }
+
+    private FakeServerHelper() {
+        mNativeFakeServerHelperAndroid = nativeInit();
+    }
+
+    /**
+     * Creates and configures FakeServer.
+     *
+     * Each call to this method should be accompanied by a later call to deleteFakeServer to avoid
+     * a memory leak.
+     */
+    public static void useFakeServer(final Context context) {
+        if (sNativeFakeServer != 0L) {
+            throw new IllegalStateException(
+                    "deleteFakeServer must be called before calling useFakeServer again.");
+        }
+
+        sNativeFakeServer = ThreadUtils.runOnUiThreadBlockingNoException(new Callable<Long>() {
+            @Override
+            public Long call() {
+                FakeServerHelper fakeServerHelper = FakeServerHelper.get();
+                long nativeFakeServer = fakeServerHelper.createFakeServer();
+                long resources = fakeServerHelper.createNetworkResources(nativeFakeServer);
+                ProfileSyncService.get(context).overrideNetworkResourcesForTest(resources);
+
+                return nativeFakeServer;
+            }
+        });
+    }
+
+    /**
+     * Deletes the existing FakeServer.
+     */
+    public static void deleteFakeServer() {
+        if (sNativeFakeServer == 0L) {
+            throw new IllegalStateException(
+                    "useFakeServer must be called before calling deleteFakeServer.");
+        }
+
+        ThreadUtils.runOnUiThreadBlockingNoException(new Callable<Void>() {
+            @Override
+            public Void call() {
+                FakeServerHelper.get().deleteFakeServer(sNativeFakeServer);
+                sNativeFakeServer = 0L;
+                return null;
+            }
+        });
+    }
+
+    /**
+     * Creates a native FakeServer object and returns its pointer. This pointer is owned by the
+     * Java caller.
+     *
+     * @return the FakeServer pointer
+     */
+    public long createFakeServer() {
+        return nativeCreateFakeServer(mNativeFakeServerHelperAndroid);
+    }
+
+    /**
+     * Creates a native NetworkResources object. This pointer is owned by the Java caller, but
+     * ownership is transferred as part of ProfileSyncService.overrideNetworkResourcesForTest.
+     *
+     * @param nativeFakeServer pointer to a native FakeServer object.
+     * @return the NetworkResources pointer
+     */
+    public long createNetworkResources(long nativeFakeServer) {
+        return nativeCreateNetworkResources(mNativeFakeServerHelperAndroid, nativeFakeServer);
+    }
+
+    /**
+     * Deletes a native FakeServer.
+     *
+     * @param nativeFakeServer the pointer to be deleted
+     */
+    public void deleteFakeServer(long nativeFakeServer) {
+        nativeDeleteFakeServer(mNativeFakeServerHelperAndroid, nativeFakeServer);
+    }
+
+    // Native methods.
+    private native long nativeInit();
+    private native long nativeCreateFakeServer(long nativeFakeServerHelperAndroid);
+    private native long nativeCreateNetworkResources(
+            long nativeFakeServerHelperAndroid, long nativeFakeServer);
+    private native void nativeDeleteFakeServer(
+            long nativeFakeServerHelperAndroid, long nativeFakeServer);
+}