Move sky/examples to sky/sdk/lib/example, and code changes to support that change. Fixes T277.

sky/sdk/README.md

 Contributing
 ============
 
 [sky_sdk](https://github.com/domokit/sky_sdk) is generated from the
 [mojo repository](https://github.com/domokit/mojo) using
 [deploy_sdk.py](https://github.com/domokit/mojo/blob/master/sky/tools/deploy_sdk.py)
 Static files (including this README.md) are located under
 [sky/sdk](https://github.com/domokit/mojo/tree/master/sky/sdk).  Pull
 requests and issue reports are glady accepted at the
 [mojo repository](https://github.com/domokit/mojo)!
@@ skipping 70 matching lines @@
 Later, if a `Component` changes state, the framework calls that component's
 `build()` function again to create a new widget tree. The framework diffs the
 new widget tree against the old widget tree and any differences are applyed
 to the underlying render tree.
 
  * To learn more about the widget system, please see the
    [widgets tutorial](lib/widgets/README.md).
  * To learn how to run Sky on your device, please see the
    [Running a Sky application](#running-a-sky-application) section in this
    document.
- * To dive into examples, please see the [examples directory](examples/).
+ * To dive into examples, please see the [examples directory](sdk/lib/example).

[abarth-chromium, 2015/06/26 21:56:40]

I think just "lib/example" given that we're already in the sdk directory.

 
 Services
 --------
 
 Sky apps can access services from the host operating system using Mojo IPC. For
 example, you can access the network using the `network_service.mojom` interface.
 Although you can use these low-level interfaces directly, you might prefer to
 access these services via libraries in the framework. For example, the
 `fetch.dart` library wraps the underlying `network_service.mojom` in an
 ergonomic interface:
@@ skipping 37 matching lines @@
    device, authorize your computer to access your device.
 
 Running a Sky application
 -------------------------
 
 The `sky` pub package includes a `sky_tool` script to assist in running
 Sky applications inside the `SkyDemo.apk` harness.  The `sky_tool` script
 expects to be run from the root directory of your application pub package. To
 run one of the examples in this SDK, try:
 
-1. `cd examples/stocks`
+1. `cd sdk/lib/example/stocks`
 
 2. `pub get` to set up a copy of the sky package in the app directory.
 
 3. `./packages/sky/sky_tool start` to start the dev server and upload your
    app to the device.
    (NOTE: add a `--install` flag to install `SkyDemo.apk` if it is not already
    installed on the device.)
 
 4. Use `adb logcat` to view any errors or Dart `print()` output from the app.
    `adb logcat -s chromium` can be used to filter only adb messages from
@@ skipping 48 matching lines @@
 [Keyboard](https://github.com/domokit/mojo/blob/master/mojo/services/keyboard/public/interfaces/keyboard.mojom)
 service to allow Sky Framework Dart code to interface with the underlying
 platform's Keyboard, but also to expose any additional non-Dart business logic
 to Sky/Dart UI code.
 
 As an example, [SkyApplication](https://github.com/domokit/mojo/blob/master/sky/shell/org/domokit/sky/shell/SkyApplication.java)
 exposes a mojo `network_service` (required by Sky Engine C++ code)
 [SkyDemoApplication](https://github.com/domokit/mojo/blob/master/sky/apk/demo/org/domokit/sky/demo/SkyDemoApplication.java)
 additionally exposes `keyboard_service` and `sensor_service` for use by the Sky
 Framework from Dart.