bluetooth: Post a task when sending GATT events to simulate another thread.

device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java

Index: device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
diff --git a/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java b/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
index 282faa877e3c0b4d7c62f3ee86d9f6520d49840b..4b3b3a828f57c95dd921b78db40d4687caf2363c 100644
--- a/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
+++ b/device/bluetooth/android/java/src/org/chromium/device/bluetooth/Wrappers.java
@@ -24,6 +24,7 @@ import android.os.Build;
 import android.os.ParcelUuid;
 
 import org.chromium.base.Log;
+import org.chromium.base.ThreadUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
@@ -48,6 +49,52 @@ class Wrappers {
     public static final int DEVICE_CLASS_UNSPECIFIED = 0x1F00;
 
     /**
+     * Wraps base.ThreadUtils.
+     * base.ThreadUtils has a set of static method to interact with the
+     * UI Thread. To be able to provide a set of test methods, ThreadUtilsWrapper
+     * uses the factory pattern.
+     */
+    static class ThreadUtilsWrapper {
+        private static Factory sFactory;
+
+        private static ThreadUtilsWrapper sInstance;
+
+        protected ThreadUtilsWrapper() {}
+
+        /**
+         * Returns the singleton instance of ThreadUtilsWrapper, creating it if needed.
+         */
+        public static ThreadUtilsWrapper getInstance() {
+            if (sInstance == null) {
+                if (sFactory == null) {
+                    sInstance = new ThreadUtilsWrapper();
+                } else {
+                    sInstance = sFactory.create();
+                }
+            }
+            return sInstance;
+        }
+
+        public void runOnUiThread(Runnable r) {
+            ThreadUtils.runOnUiThread(r);
+        }
+
+        /**
+         * Instantiate this to explain how to create a ThreadUtilsWrapper instance in
+         * ThreadUtilsWrapper.getInstance().
+         */
+        public interface Factory { public ThreadUtilsWrapper create(); }
+
+        /**
+         * Call this to use a different subclass of ThreadUtilsWrapper throughout the program.
+         */
+        public static void setFactory(Factory factory) {
+            sFactory = factory;
+            sInstance = null;
+        }
+    }
+
+    /**
      * Wraps android.bluetooth.BluetoothAdapter.
      */
     static class BluetoothAdapterWrapper {