Android AppRTCDemo: Add slider for changing camera capture quality during call

webrtc/examples/androidapp/res/layout/fragment_call.xml

Index: webrtc/examples/androidapp/res/layout/fragment_call.xml
diff --git a/webrtc/examples/androidapp/res/layout/fragment_call.xml b/webrtc/examples/androidapp/res/layout/fragment_call.xml
index 70a9a28197a1ae49378e703507181d3bff9fec77..5d71d73f50d4328ca1937b44bba756a133d1dcea 100644
--- a/webrtc/examples/androidapp/res/layout/fragment_call.xml
+++ b/webrtc/examples/androidapp/res/layout/fragment_call.xml
@@ -18,7 +18,8 @@
     <LinearLayout
            android:id="@+id/buttons_call_container"
            android:orientation="horizontal"
-           android:layout_alignParentBottom="true"
+           android:layout_above="@+id/capture_format_text_call"
+           android:layout_alignWithParentIfMissing="true"
            android:layout_marginBottom="32dp"
            android:layout_centerHorizontal="true"
            android:layout_width="wrap_content"
@@ -48,4 +49,22 @@
            android:layout_height="48dp"/>
     </LinearLayout>
 
+    <TextView
+        android:id="@+id/capture_format_text_call"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:layout_above="@+id/capture_format_slider_call"
+        android:textSize="16sp"
+        android:text="Slide to change capture format"/>
+
+    <SeekBar
+        android:id="@+id/capture_format_slider_call"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_centerHorizontal="true"
+        android:layout_alignParentBottom="true"
+        android:progress="50"
+        android:layout_margin="8dp"/>
+
 </RelativeLayout>