Camera: Fix client permission check

Modify StageFright's CameraSource to forward calling PID as
client PID when connecting to CameraService so CameraService
can check if the client PID has permission to use camera.

Change CameraService to check calling UID is trusted before
using the passed in client PID and client UID to verify permission.

Bug: 24511454
Change-Id: I4906ab73510e2c75714690bed675e3c13aca3ccf
diff --git a/include/camera/Camera.h b/include/camera/Camera.h
index f7bf29c..f19d296 100644
--- a/include/camera/Camera.h
+++ b/include/camera/Camera.h
@@ -52,7 +52,7 @@
     typedef ICamera               TCamUser;
     typedef ICameraClient         TCamCallbacks;
     typedef status_t (ICameraService::*TCamConnectService)(const sp<ICameraClient>&,
-                                                           int, const String16&, int,
+                                                           int, const String16&, int, int,
                                                            /*out*/
                                                            sp<ICamera>&);
     static TCamConnectService     fnConnectService;
@@ -67,12 +67,15 @@
     enum {
         USE_CALLING_UID = ICameraService::USE_CALLING_UID
     };
+    enum {
+        USE_CALLING_PID = ICameraService::USE_CALLING_PID
+    };
 
             // construct a camera client from an existing remote
     static  sp<Camera>  create(const sp<ICamera>& camera);
     static  sp<Camera>  connect(int cameraId,
                                 const String16& clientPackageName,
-                                int clientUid);
+                                int clientUid, int clientPid);
 
     static  status_t  connectLegacy(int cameraId, int halVersion,
                                      const String16& clientPackageName,