Java: Introduce ResultAnd<> and use it.

mojo/public/java/system/src/org/chromium/mojo/system/ResultAnd.java

Index: mojo/public/java/system/src/org/chromium/mojo/system/ResultAnd.java
diff --git a/mojo/public/java/system/src/org/chromium/mojo/system/ResultAnd.java b/mojo/public/java/system/src/org/chromium/mojo/system/ResultAnd.java
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index 0000000000000000000000000000000000000000..656d0d64e49f49c8478a9bb8e70394cf20693000
--- /dev/null
+++ b/mojo/public/java/system/src/org/chromium/mojo/system/ResultAnd.java
@@ -0,0 +1,34 @@
+// 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.mojo.system;
+
+/**
+ * Container that contains a mojo result and a value.
+ *
+ * @param <A> the type of the value.
+ */
+public class ResultAnd<A> {

[etiennej, 2015/04/03 14:18:20]

(very optional) Something I've seen sometimes in these sort of classes is a
"ok()" method that directly checks if mMojoResult == MojoResult.OK, as this is
what people tend to want.

[qsr, 2015/04/03 14:32:54]

 This class is sometimes used even when the result is not OK, so I prefer not to
add this method for the moment. If this is used a lot more, and comes again and
again, we can think about this.

+    private final int mMojoResult;
+    private final A mValue;
+
+    public ResultAnd(int result, A value) {
+        this.mMojoResult = result;
+        this.mValue = value;
+    }
+
+    /**
+     * Returns the mojo result.
+     */
+    public int getMojoResult() {
+        return mMojoResult;
+    }
+
+    /**
+     * Returns the value.
+     */
+    public A getValue() {
+        return mValue;
+    }
+}