Get mojo_shell building inside chromium checkout.

mojo/shell/android/apk/src/org/chromium/mojo/shell/Keyboard.java

+// 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.shell;
+
+import android.app.Activity;
+import android.content.Context;
+import android.view.View;
+import android.view.inputmethod.InputMethodManager;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.base.JNINamespace;
+
+/**
+ * Interaction with the keyboard.
+ */
+@JNINamespace("mojo::shell")
+public class Keyboard {
+    @CalledByNative
+    private static void showSoftKeyboard(Activity activity) {
+        View v = activity.getCurrentFocus();
+        InputMethodManager imm =
+                (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
+        imm.showSoftInput(v, InputMethodManager.SHOW_IMPLICIT);
+    }
+
+    @CalledByNative
+    private static void hideSoftKeyboard(Activity activity) {
+        View v = activity.getCurrentFocus();
+        InputMethodManager imm =
+                (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
+        imm.hideSoftInputFromWindow(v.getApplicationWindowToken(), 0);
+    }
+}