Add entirely untested secondary device init

protos/DeviceMessages.proto

@@ -0,0 +1,30 @@
+package textsecure;
+
+message DeviceInit {
+ required bytes masterEphemeralPubKey = 1;
+ required bytes identityKeyMessage    = 2; // contains an IdentityKey
+}
+
+message IdentityKey {
+ required bytes   identityKey       = 1;
+ required string  phoneNumber       = 2;
+ required string  server            = 3;
+ required bool    masterSupportsSms = 4;
+ required uint32  provisioningCode  = 5;
+}
+
+message DeviceControl {
+  enum Type {
+    UNKNOWN                            = 0;
+    NEW_DEVICE_REGISTERED              = 1; // Requries only newDeviceId
+    SENT_MESSAGE                       = 2; // Requires only message
+  }
+  message MessageSent {
+    required string  otherNumber = 1; // The destination account (ie phone #), not device
+    required uint64  timestamp   = 2;
+    required bytes   message     = 3; // PushMessageContent
+  }
+  required Type        type        = 1;
+  optional uint32      newDeviceId = 2;
+  optional MessageSent message     = 3;
+}