Fix a media server crash (bug 1807910): part one

Add a factory method that creates a Camera object from a remote client

Next:
The changes in authordriver.cpp and android_camera_input.cpp will come.
and the constructor for Camera object will be removed.

include/ui/Camera.h

@@ -78,8 +78,8 @@ class Camera : public BnCameraClient, public IBinder::DeathRecipient
 {
 public:
             // construct a camera client from an existing remote
-            Camera(const sp<ICamera>& camera);
-
+            Camera(const sp<ICamera>& camera);  // to be removed
+    static  sp<Camera>  create(const sp<ICamera>& camera);
     static  sp<Camera>  connect();
                         ~Camera();
             void        init();

libs/ui/Camera.cpp

@@ -75,6 +75,19 @@ Camera::Camera(const sp<ICamera>& camera)
     }
 }
 
+
+sp<Camera> Camera::create(const sp<ICamera>& camera)
+{
+    sp<Camera> c = new Camera();
+    // connect this client to existing camera remote
+    if (camera->connect(c) == NO_ERROR) {
+        c->mStatus = NO_ERROR;
+        c->mCamera = camera;
+        camera->asBinder()->linkToDeath(c);
+    }
+    return c;
+}
+
 void Camera::init()
 {
     mStatus = UNKNOWN_ERROR;