Un-hide Connection#onReject(String) and its associated capability

The capability is CAPABILITY_CAN_SEND_RESPONSE_VIA_CONNECTION

Bug: 27501686
Change-Id: Id73bb99650ca8440a9f4e87bfe533a97c4d19778
diff --git a/api/current.txt b/api/current.txt
index a7d0483..5eff3ad 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -36263,6 +36263,7 @@
     method public void onPostDialContinue(boolean);
     method public void onPullExternalCall();
     method public void onReject();
+    method public void onReject(java.lang.String);
     method public void onSeparate();
     method public void onStateChanged(int);
     method public void onStopDtmfTone();
@@ -36292,6 +36293,7 @@
     field public static final int CAPABILITY_CANNOT_DOWNGRADE_VIDEO_TO_AUDIO = 8388608; // 0x800000
     field public static final int CAPABILITY_CAN_PAUSE_VIDEO = 1048576; // 0x100000
     field public static final int CAPABILITY_CAN_PULL_CALL = 33554432; // 0x2000000
+    field public static final int CAPABILITY_CAN_SEND_RESPONSE_VIA_CONNECTION = 4194304; // 0x400000
     field public static final int CAPABILITY_CAN_UPGRADE_TO_VIDEO = 524288; // 0x80000
     field public static final int CAPABILITY_DISCONNECT_FROM_CONFERENCE = 8192; // 0x2000
     field public static final int CAPABILITY_HOLD = 1; // 0x1
diff --git a/api/system-current.txt b/api/system-current.txt
index 5835643..c856e96 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -38876,6 +38876,7 @@
     method public void onPostDialContinue(boolean);
     method public void onPullExternalCall();
     method public void onReject();
+    method public void onReject(java.lang.String);
     method public void onSeparate();
     method public void onStateChanged(int);
     method public void onStopDtmfTone();
@@ -38905,6 +38906,7 @@
     field public static final int CAPABILITY_CANNOT_DOWNGRADE_VIDEO_TO_AUDIO = 8388608; // 0x800000
     field public static final int CAPABILITY_CAN_PAUSE_VIDEO = 1048576; // 0x100000
     field public static final int CAPABILITY_CAN_PULL_CALL = 33554432; // 0x2000000
+    field public static final int CAPABILITY_CAN_SEND_RESPONSE_VIA_CONNECTION = 4194304; // 0x400000
     field public static final int CAPABILITY_CAN_UPGRADE_TO_VIDEO = 524288; // 0x80000
     field public static final int CAPABILITY_DISCONNECT_FROM_CONFERENCE = 8192; // 0x2000
     field public static final int CAPABILITY_HOLD = 1; // 0x1
diff --git a/api/test-current.txt b/api/test-current.txt
index ffc57b7..11b64b2 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -36335,6 +36335,7 @@
     method public void onPostDialContinue(boolean);
     method public void onPullExternalCall();
     method public void onReject();
+    method public void onReject(java.lang.String);
     method public void onSeparate();
     method public void onStateChanged(int);
     method public void onStopDtmfTone();
@@ -36364,6 +36365,7 @@
     field public static final int CAPABILITY_CANNOT_DOWNGRADE_VIDEO_TO_AUDIO = 8388608; // 0x800000
     field public static final int CAPABILITY_CAN_PAUSE_VIDEO = 1048576; // 0x100000
     field public static final int CAPABILITY_CAN_PULL_CALL = 33554432; // 0x2000000
+    field public static final int CAPABILITY_CAN_SEND_RESPONSE_VIA_CONNECTION = 4194304; // 0x400000
     field public static final int CAPABILITY_CAN_UPGRADE_TO_VIDEO = 524288; // 0x80000
     field public static final int CAPABILITY_DISCONNECT_FROM_CONFERENCE = 8192; // 0x2000
     field public static final int CAPABILITY_HOLD = 1; // 0x1
diff --git a/telecomm/java/android/telecom/Connection.java b/telecomm/java/android/telecom/Connection.java
index 5c34bd8..51a6588 100644
--- a/telecomm/java/android/telecom/Connection.java
+++ b/telecomm/java/android/telecom/Connection.java
@@ -260,7 +260,6 @@
     /**
      * Indicates that the connection itself wants to handle any sort of reply response, rather than
      * relying on SMS.
-     * @hide
      */
     public static final int CAPABILITY_CAN_SEND_RESPONSE_VIA_CONNECTION = 0x00400000;
 
@@ -1887,9 +1886,8 @@
     public void onReject() {}
 
     /**
-     * Notifies ths Connection of a request reject with a message.
-     *
-     * @hide
+     * Notifies this Connection, which is in {@link #STATE_RINGING}, of
+     * a request to reject with a message.
      */
     public void onReject(String replyMessage) {}