Perform camera permission and app ops check when setting camera for VT.

When a calling InCallService attempts to use the setCamera API on the
VideoCall, Telecom will perform a permission check to ensure that the
caller has the correct camera permission and passes the app-ops camera
check.  A failure to set the camera will result in a callback via the
call session event API.

This got a little messy as the app ops package name needs to come from the
InCallService, and handler usage in the VideoProvider API means we had to
pass around the uid/pid of the caller, obtained before we trampoline onto
the handler.

Test: Unit tests added, manual testing performed.
Bug: 32747443
Change-Id: I555a04f9c3fb45e60bb811f64ba855ccf2e3b0e2

telecomm/java/android/telecom/ParcelableCall.java

@@ -190,10 +190,10 @@ public final class ParcelableCall implements Parcelable {
 
      * @return The video call.
      */
-    public VideoCallImpl getVideoCallImpl() {
+    public VideoCallImpl getVideoCallImpl(String callingPackageName) {
         if (mVideoCall == null && mVideoCallProvider != null) {
             try {
-                mVideoCall = new VideoCallImpl(mVideoCallProvider);
+                mVideoCall = new VideoCallImpl(mVideoCallProvider, callingPackageName);
             } catch (RemoteException ignored) {
                 // Ignore RemoteException.
             }