[android_webview] Add a generic callback JNI bridge.

android_webview/unittestjava/src/org/chromium/android_webview/unittest/CallbackJNIBridgeUnittest.java

Index: android_webview/unittestjava/src/org/chromium/android_webview/unittest/CallbackJNIBridgeUnittest.java
diff --git a/android_webview/unittestjava/src/org/chromium/android_webview/unittest/CallbackJNIBridgeUnittest.java b/android_webview/unittestjava/src/org/chromium/android_webview/unittest/CallbackJNIBridgeUnittest.java
new file mode 100644
index 0000000000000000000000000000000000000000..02c01a79d7bc43fb75942e72d47fd7bd9b5761f0
--- /dev/null
+++ b/android_webview/unittestjava/src/org/chromium/android_webview/unittest/CallbackJNIBridgeUnittest.java
@@ -0,0 +1,71 @@
+// Copyright 2013 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.android_webview.unittest;
+
+import android.webkit.ValueCallback;
+
+import org.chromium.android_webview.CallbackJNIBridge;
+import org.chromium.base.CalledByNative;
+
+class CallbackJNIBridgeUnittest {
+  private CallbackJNIBridgeUnittest() {
+  }
+
+  private static class FromJavaCallbackIntFixture {
+      private int mCallbackValue;
+
+      @CalledByNative("FromJavaCallbackIntFixture")
+      static FromJavaCallbackIntFixture create() {
+          return new FromJavaCallbackIntFixture();
+      }
+
+      @CalledByNative("FromJavaCallbackIntFixture")
+      Object createCallback() {
+          return CallbackJNIBridge.wrapCallbackInt(new ValueCallback<Integer>() {
+              @Override
+              public void onReceiveValue(Integer value) {
+                  assert mCallbackValue == 0;
+                  mCallbackValue = value;
+              }
+          });
+      }
+
+      @CalledByNative("FromJavaCallbackIntFixture")
+      int getCallbackValue() {
+          return mCallbackValue;
+      }
+  }
+
+  @SuppressWarnings("unchecked")
+  @CalledByNative
+  static void invokeValueCallbackInt(ValueCallback callback, int value) {
+      callback.onReceiveValue(value);
+  }
+
+  private static class FromJavaCallbackStringFixture {
+      private String mCallbackValue;
+
+      @CalledByNative("FromJavaCallbackStringFixture")
+      static FromJavaCallbackStringFixture create() {
+          return new FromJavaCallbackStringFixture();
+      }
+
+      @CalledByNative("FromJavaCallbackStringFixture")
+      Object createCallback() {
+          return CallbackJNIBridge.wrapCallback(new ValueCallback<String>() {
+              @Override
+              public void onReceiveValue(String value) {
+                  assert mCallbackValue == null;
+                  mCallbackValue = value;
+              }
+          });
+      }
+
+      @CalledByNative("FromJavaCallbackStringFixture")
+      boolean checkCallbackValue() {
+          return mCallbackValue.equals("test string");
+      }
+  }
+}