Camera.open() should only return back-facing camera.

Also update current.xml and 9.xml. setRotationHint was also
missing from 9.xml.
bug:3173302

Change-Id: Idd3f7417a4d35c65910e9b08a1bfd157b91e1baa

api/9.xml

@@ -73399,16 +73399,6 @@
  visibility="public"
 >
 </field>
-<field name="CAMERA_ID_DEFAULT"
- type="int"
- transient="false"
- volatile="false"
- static="true"
- final="false"
- deprecated="not deprecated"
- visibility="public"
->
-</field>
 </class>
 <interface name="Camera.AutoFocusCallback"
  abstract="true"
@@ -86967,6 +86957,19 @@
 <parameter name="listener" type="android.media.MediaRecorder.OnInfoListener">
 </parameter>
 </method>
+<method name="setOrientationHint"
+ return="void"
+ abstract="false"
+ native="false"
+ synchronized="false"
+ static="false"
+ final="false"
+ deprecated="not deprecated"
+ visibility="public"
+>
+<parameter name="degrees" type="int">
+</parameter>
+</method>
 <method name="setOutputFile"
  return="void"
  abstract="false"

api/current.xml

@@ -73399,16 +73399,6 @@
  visibility="public"
 >
 </field>
-<field name="CAMERA_ID_DEFAULT"
- type="int"
- transient="false"
- volatile="false"
- static="true"
- final="false"
- deprecated="not deprecated"
- visibility="public"
->
-</field>
 </class>
 <interface name="Camera.AutoFocusCallback"
  abstract="true"

core/java/android/hardware/Camera.java

@@ -211,8 +211,7 @@ public class Camera {
      * blocking the main application UI thread.
      *
      * @param cameraId the hardware camera to access, between 0 and
-     *     {@link #getNumberOfCameras()}-1.  Use {@link #CAMERA_ID_DEFAULT}
-     *     to access the default camera.
+     *     {@link #getNumberOfCameras()}-1.
      * @return a new Camera object, connected, locked and ready for use.
      * @throws RuntimeException if connection to the camera service fails (for
      *     example, if the camera is in use by another process).
@@ -222,18 +221,21 @@ public class Camera {
     }
 
     /**
-     * The id for the default camera.
-     * @see #open(int)
-     */
-    public static int CAMERA_ID_DEFAULT = 0;
-
-    /**
-     * Equivalent to Camera.open(Camera.CAMERA_ID_DEFAULT).
-     * Creates a new Camera object to access the default camera.
+     * Creates a new Camera object to access the first back-facing camera on the
+     * device. If the device does not have a back-facing camera, this returns
+     * null.
      * @see #open(int)
      */
     public static Camera open() {
-        return new Camera(CAMERA_ID_DEFAULT);
+        int numberOfCameras = getNumberOfCameras();
+        CameraInfo cameraInfo = new CameraInfo();
+        for (int i = 0; i < numberOfCameras; i++) {
+            getCameraInfo(i, cameraInfo);
+            if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
+                return new Camera(i);
+            }
+        }
+        return null;
     }
 
     Camera(int cameraId) {