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/RemoteConnection.java

@@ -408,6 +408,8 @@ public final class RemoteConnection {
 
         private final IVideoProvider mVideoProviderBinder;
 
+        private final String mCallingPackage;
+
         /**
          * ConcurrentHashMap constructor params: 8 is initial table size, 0.9f is
          * load factor before resizing, 1 means we only expect a single thread to
@@ -416,8 +418,9 @@ public final class RemoteConnection {
         private final Set<Callback> mCallbacks = Collections.newSetFromMap(
                 new ConcurrentHashMap<Callback, Boolean>(8, 0.9f, 1));
 
-        VideoProvider(IVideoProvider videoProviderBinder) {
+        VideoProvider(IVideoProvider videoProviderBinder, String callingPackage) {
             mVideoProviderBinder = videoProviderBinder;
+            mCallingPackage = callingPackage;
             try {
                 mVideoProviderBinder.addVideoCallback(mVideoCallbackServant.getStub().asBinder());
             } catch (RemoteException e) {
@@ -452,7 +455,7 @@ public final class RemoteConnection {
          */
         public void setCamera(String cameraId) {
             try {
-                mVideoProviderBinder.setCamera(cameraId);
+                mVideoProviderBinder.setCamera(cameraId, mCallingPackage);
             } catch (RemoteException e) {
             }
         }
@@ -628,7 +631,7 @@ public final class RemoteConnection {
      * @hide
      */
     RemoteConnection(String callId, IConnectionService connectionService,
-            ParcelableConnection connection) {
+            ParcelableConnection connection, String callingPackage) {
         mConnectionId = callId;
         mConnectionService = connectionService;
         mConnected = true;
@@ -640,7 +643,7 @@ public final class RemoteConnection {
         mVideoState = connection.getVideoState();
         IVideoProvider videoProvider = connection.getVideoProvider();
         if (videoProvider != null) {
-            mVideoProvider = new RemoteConnection.VideoProvider(videoProvider);
+            mVideoProvider = new RemoteConnection.VideoProvider(videoProvider, callingPackage);
         } else {
             mVideoProvider = null;
         }