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/RemoteConnectionService.java

@@ -283,9 +283,13 @@ final class RemoteConnectionService {
         @Override
         public void setVideoProvider(String callId, IVideoProvider videoProvider,
                 Session.Info sessionInfo) {
+
+            String callingPackage = mOurConnectionServiceImpl.getApplicationContext()
+                    .getOpPackageName();
             RemoteConnection.VideoProvider remoteVideoProvider = null;
             if (videoProvider != null) {
-                remoteVideoProvider = new RemoteConnection.VideoProvider(videoProvider);
+                remoteVideoProvider = new RemoteConnection.VideoProvider(videoProvider,
+                        callingPackage);
             }
             findConnectionForAction(callId, "setVideoProvider")
                     .setVideoProvider(remoteVideoProvider);
@@ -351,8 +355,10 @@ final class RemoteConnectionService {
         @Override
         public void addExistingConnection(String callId, ParcelableConnection connection,
                 Session.Info sessionInfo) {
+            String callingPackage = mOurConnectionServiceImpl.getApplicationContext().
+                    getOpPackageName();
             RemoteConnection remoteConnection = new RemoteConnection(callId,
-                    mOutgoingConnectionServiceRpc, connection);
+                    mOutgoingConnectionServiceRpc, connection, callingPackage);
             mConnectionById.put(callId, remoteConnection);
             remoteConnection.registerCallback(new RemoteConnection.Callback() {
                 @Override