API Review cleanups.

- New @SystemApis on Conference and PhoneAccount were missing the required
permissions annotations.
- Rename PROPERTY_ASSISTED_DIALING_USED to PROPERTY_ASSISTED_DIALING
- Standardize get/setConnectionStartElapsedRealtimeMillis method naming
across Connection and Conference classes.
- Clarify Conference#sendConferenceEvent API documentation to match the
docs present for similar method in Connection; include some examples of
valid event/extras combinations.
- Update TelecomManager#getDefaultdialerPackage to use UserHandle instead
of userId.
- Move Conference#getConnectionStartElapsedRealtimeMillis to public API
since the setter is already part of the public API.

Test: Run Telecom and Telephony CTS tests.
Test: Run Telephony unit tests.
Test: Perform manual single-party-conference regression test to confirm
that conference behavior does not regress.

Bug: 147301297
Bug: 148286830
Bug: 148284863
Bug: 148284843
Bug: 148287068
Bug: 148285484
Bug: 148285560
Change-Id: I1f446d81859fa109d74af3661a42a0bd224de5aa
Merged-In: I1f446d81859fa109d74af3661a42a0bd224de5aa

telecomm/java/android/telecom/ConnectionService.java

@@ -18,7 +18,6 @@ package android.telecom;
 
 import android.annotation.NonNull;
 import android.annotation.Nullable;
-import android.annotation.RequiresPermission;
 import android.annotation.SdkConstant;
 import android.annotation.SystemApi;
 import android.app.Service;
@@ -1778,7 +1777,7 @@ public abstract class ConnectionService extends Service {
                         null : conference.getVideoProvider().getInterface(),
                 conference.getVideoState(),
                 conference.getConnectTimeMillis(),
-                conference.getConnectionStartElapsedRealTime(),
+                conference.getConnectionStartElapsedRealtimeMillis(),
                 conference.getStatusHints(),
                 conference.getExtras(),
                 conference.getAddress(),
@@ -1884,7 +1883,7 @@ public abstract class ConnectionService extends Service {
                         connection.isRingbackRequested(),
                         connection.getAudioModeIsVoip(),
                         connection.getConnectTimeMillis(),
-                        connection.getConnectElapsedTimeMillis(),
+                        connection.getConnectionStartElapsedRealtimeMillis(),
                         connection.getStatusHints(),
                         connection.getDisconnectCause(),
                         createIdList(connection.getConferenceables()),
@@ -2374,7 +2373,7 @@ public abstract class ConnectionService extends Service {
                             null : conference.getVideoProvider().getInterface(),
                     conference.getVideoState(),
                     conference.getConnectTimeMillis(),
-                    conference.getConnectionStartElapsedRealTime(),
+                    conference.getConnectionStartElapsedRealtimeMillis(),
                     conference.getStatusHints(),
                     conference.getExtras(),
                     conference.getAddress(),
@@ -2465,7 +2464,7 @@ public abstract class ConnectionService extends Service {
                     connection.isRingbackRequested(),
                     connection.getAudioModeIsVoip(),
                     connection.getConnectTimeMillis(),
-                    connection.getConnectElapsedTimeMillis(),
+                    connection.getConnectionStartElapsedRealtimeMillis(),
                     connection.getStatusHints(),
                     connection.getDisconnectCause(),
                     emptyList,