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/camera/CameraBase.cpp b/camera/CameraBase.cpp
index 5d50aa8..9ee7ae5 100644
--- a/camera/CameraBase.cpp
+++ b/camera/CameraBase.cpp
@@ -92,7 +92,7 @@
 template <typename TCam, typename TCamTraits>
 sp<TCam> CameraBase<TCam, TCamTraits>::connect(int cameraId,
                                                const String16& clientPackageName,
-                                               int clientUid)
+                                               int clientUid, int clientPid)
 {
     ALOGV("%s: connect", __FUNCTION__);
     sp<TCam> c = new TCam(cameraId);
@@ -103,7 +103,7 @@
     if (cs != 0) {
         TCamConnectService fnConnectService = TCamTraits::fnConnectService;
         status = (cs.get()->*fnConnectService)(cl, cameraId, clientPackageName, clientUid,
-                                             /*out*/ c->mCamera);
+                                               clientPid, /*out*/ c->mCamera);
     }
     if (status == OK && c->mCamera != 0) {
         IInterface::asBinder(c->mCamera)->linkToDeath(c);