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..636a1a6c4681ac31431f208fa3868e6c61d9bf3e
--- /dev/null
+++ b/base/android/java/debug_src/org/chromium/base/Reflect.java
@@ -0,0 +1,53 @@
+// 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 {
+    static void setField(Object instance, String name, Object val)
+            throws NoSuchFieldException {
+        Field field = findField(instance, name);
+        try {
+            field.setAccessible(true);
+            field.set(instance, val);
+        } catch (IllegalAccessException e) {
+            // This shouldn't happen.
+        }
+    }
+
+    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;
+    }
+
+    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;
+    }
+
+    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());
+    }
+}