Support library: Updated API docs for media item presenter

Unexposed MediaNowPlayingView and MediaRowFocusView from the public docs.

Bug: 30088038
Bug: 30088617
Change-Id: I3e9f004821cf5716651a30c5069dec6ac8529c3c
(cherry picked from commit 1dcc356c7c60f493010d69ded3d8e8f92f54217d)
diff --git a/api/current.txt b/api/current.txt
index aa64e15..d4522ad 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -2897,10 +2897,6 @@
     method public android.support.v17.leanback.widget.HorizontalGridView getGridView();
   }
 
-  public class MediaNowPlayingView extends android.widget.LinearLayout {
-    ctor public MediaNowPlayingView(android.content.Context, android.util.AttributeSet);
-  }
-
   public abstract interface MultiActionsProvider {
     method public abstract android.support.v17.leanback.widget.MultiActionsProvider.MultiAction[] getActions();
   }
diff --git a/v17/leanback/src/android/support/v17/leanback/widget/AbstractMediaItemPresenter.java b/v17/leanback/src/android/support/v17/leanback/widget/AbstractMediaItemPresenter.java
index e744206..25fddb6 100644
--- a/v17/leanback/src/android/support/v17/leanback/widget/AbstractMediaItemPresenter.java
+++ b/v17/leanback/src/android/support/v17/leanback/widget/AbstractMediaItemPresenter.java
@@ -365,10 +365,10 @@
 
 
         /**
-         * Flips to the view at index 'position' specified in the layout file for media item number
-         * view.
-         * @param position The position of the new view within the layout file to which the media
-         *                 item number view is flipped.
+         * Flips to the view at index 'position'. This position corresponds to the index of a
+         * particular view within the ViewFlipper layout specified for the MediaItemNumberView
+         * (see playbackMediaItemNumberViewFlipperLayout attribute).
+         * @param position The index of the child view to display.
          */
         public void setSelectedMediaItemNumberView(int position) {
             if (position >= 0 & position < mMediaItemNumberViewFlipper.getChildCount()) {
@@ -551,8 +551,8 @@
     }
 
     /**
-     * Unbinds the play state view from the given ViewHolder
-     * @param vh The ViewHolder to unbind from
+     * Called when the given ViewHolder wants to unbind the play state view.
+     * @param vh The ViewHolder to unbind from.
      */
     public void onUnbindMediaPlayState(ViewHolder vh) {
     }
@@ -656,4 +656,4 @@
 
         }
     }
-}
\ No newline at end of file
+}
diff --git a/v17/leanback/src/android/support/v17/leanback/widget/MediaNowPlayingView.java b/v17/leanback/src/android/support/v17/leanback/widget/MediaNowPlayingView.java
index d619d8c..f62fde5 100644
--- a/v17/leanback/src/android/support/v17/leanback/widget/MediaNowPlayingView.java
+++ b/v17/leanback/src/android/support/v17/leanback/widget/MediaNowPlayingView.java
@@ -26,6 +26,7 @@
 
 /**
  * The view displaying 3 animated peak meters next to each other when a media item is playing.
+ * @hide
  */
 public class MediaNowPlayingView extends LinearLayout{