GN(android): Add scripts & runtime logic for installing _managed apks

base/android/java/debug_src/org/chromium/base/Reflect.java

Index: base/android/java/debug_src/org/chromium/base/Reflect.java
diff --git a/base/android/java/debug_src/org/chromium/base/Reflect.java b/base/android/java/debug_src/org/chromium/base/Reflect.java
new file mode 100644
index 0000000000000000000000000000000000000000..c8e94a0b3950f5fb8efc1816825aab479d0d3ee5
--- /dev/null
+++ b/base/android/java/debug_src/org/chromium/base/Reflect.java
@@ -0,0 +1,74 @@
+// Copyright 2015 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.base;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.Field;
+
+/**
+ * Reflection helper methods.
+ */
+final class Reflect {
+    /**
+     * Sets the value of an object's field (even if it's not visible).
+     *
+     * @param instance The object containing the field to set.
+     * @param name The name of the field to set.
+     * @param value The new value for the field.
+     */
+    static void setField(Object instance, String name, Object value)
+            throws NoSuchFieldException {
+        Field field = findField(instance, name);
+        try {
+            field.setAccessible(true);
+            field.set(instance, value);
+        } catch (IllegalAccessException e) {
+            // This shouldn't happen.
+        }
+    }
+
+    /**
+     * Retrieves the value of an object's field (even if it's not visible).
+     *
+     * @param instance The object containing the field to set.
+     * @param name The name of the field to set.
+     * @return The field's value. Primitive values are returned as their boxed type.
+     */
+    static Object getField(Object instance, String name) throws NoSuchFieldException {
+        Field field = findField(instance, name);
+        try {
+            field.setAccessible(true);
+            return field.get(instance);
+        } catch (IllegalAccessException e) {
+            // This shouldn't happen.
+        }
+        return null;
+    }
+
+    /**
+     * Concatenates two arrays into a new array. The arrays must be of the same type.
+     */
+    static Object[] concatArrays(Object[] left, Object[] right) {
+        Object[] result = (Object[]) (Array.newInstance(
+                left.getClass().getComponentType(), left.length + right.length));
+        System.arraycopy(left, 0, result, 0, left.length);
+        System.arraycopy(right, 0, result, left.length, right.length);
+        return result;
+    }
+
+    /**
+     * Finds the Field with the given name for the given object, traversing superclasses if
+     * necessary.
+     */
+    private static Field findField(Object instance, String name) throws NoSuchFieldException {
+        for (Class<?> clazz = instance.getClass(); clazz != null; clazz = clazz.getSuperclass()) {
+            try {
+                return clazz.getDeclaredField(name);
+            } catch (NoSuchFieldException e) {
+            }
+        }
+        throw new NoSuchFieldException("Field " + name + " not found in " + instance.getClass());
+    }
+}