Add android.mojo application.

mojo/services/android/interfaces/activity.mojom

+// 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.
+
+[DartPackage="mojo_services"]
+module activity;
+
+struct StringExtra {
+  string name;
+  string value;
+};
+
+struct ComponentName {
+  string package_name;
+  string class_name;
+};
+
+struct Intent {

[dynin, 2015/11/23 19:47:41]

We also need the type field here to resolve
https://github.com/domokit/mojo/issues/557
I know Flutter doesn;t support it, but for the syncslides demo we need to launch
a videoplayer, and they to do it is to set the type to "video/*".
If the type is not specified, then the Chrome browser is launched, which
interrupts the presentation.

[qsr, 2015/11/24 09:10:31]

Done.

+  string action;
+  string url;
+  uint32 flags;
+  ComponentName? component;
+  array<StringExtra>? string_extras;
+};
+
+struct TaskDescription {
+  string? label;
+  uint32 primaryColor;
+};
+
+enum SystemUIVisibility {
+  STANDARD,
+  FULLSCREEN,
+  IMMERSIVE,
+};
+
+// See http://developer.android.com/intl/es/reference/android/R.attr.html#screenOrientation
+enum ScreenOrientation {
+  UNSPECIFIED,
+  LANDSCAPE,
+  PORTRAIT,
+  NOSENSOR,
+};
+
+// TODO(abarth): This interface seems very specific to Android. Do we want to
+//               have a higher-level abstraction here? Do we want a collection
+//               of services that only work on specific platforms? We need to
+//               figure out how to rationalize this interface across platforms.
+[ServiceName="activity::Activity"]
+interface Activity {
+  GetUserFeedback(UserFeedback& user_feedback);
+
+  StartActivity(Intent intent);
+  FinishCurrentActivity();
+  SetTaskDescription(TaskDescription description);
+  SetSystemUIVisibility(SystemUIVisibility visibility);
+  SetRequestedOrientation(ScreenOrientation orientation);
+};
+
+interface PathService {
+  // Where the application files are.
+  GetAppDataDir() => (string path);
+
+  // Where to store long-term files.
+  GetFilesDir() => (string path);
+
+  // Where to store short-term files.
+  GetCacheDir() => (string path);
+};
+
+enum HapticFeedbackType {
+  LONG_PRESS,
+  VIRTUAL_KEY,
+  KEYBOARD_TAP,
+  CLOCK_TICK,
+};
+
+enum AuralFeedbackType {
+  CLICK,
+  NAVIGATION_LEFT,
+  NAVIGATION_UP,
+  NAVIGATION_RIGHT,
+  NAVIGATION_DOWN,
+};
+
+interface UserFeedback {
+  PerformHapticFeedback(HapticFeedbackType type);
+  PerformAuralFeedback(AuralFeedbackType type);
+};