Merge "Document WebView Metrics opt out API"

 * instead.

 * </p>

 *

 * <h3>Metrics</h3>

 *

 * <p>

 * WebView may upload anonymous diagnostic data to Google when the user has consented. This data

 * helps Google improve WebView. Data is collected on a per-app basis for each app which has

 * instantiated a WebView. An individual app can opt out of this feature by putting the following

 * tag in its manifest:

 * </p>

 * <pre>

 * <meta-data android:name="android.webkit.WebView.MetricsOptOut"

 *            android:value="true" />

 * </pre>

 * <p>

 * Data will only be uploaded for a given app if the user has consented AND the app has not opted

 * out.

 * </p>

 *

 */

// Implementation notes.

// The WebView is a thin API class that delegates its public API to a backend WebViewProvider