Merge "Fix typo in activity_testing.jd" into lmp-mr1-dev

    This changes when you run tests against the application. With instrumentation-based classes,

    you can invoke methods against the UI of the application under test. The other test classes

    don't allow this. To run an entire test method on the UI thread, you can annotate the thread

    with <code>@UIThreadTest</code>. Notice that this will run <em>all</em> of the method statements

    with <code>@UiThreadTest</code>. Notice that this will run <em>all</em> of the method statements

    on the UI thread.  Methods that do not interact with the UI are not allowed; for example, you

    can't invoke <code>Instrumentation.waitForIdleSync()</code>.

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