Undoing revert, cl is not the cause of gcm crash on canary.

components/copresence/proto/push_message.proto

Index: components/copresence/proto/push_message.proto
diff --git a/components/copresence/proto/push_message.proto b/components/copresence/proto/push_message.proto
new file mode 100644
index 0000000000000000000000000000000000000000..239e88525b11e853045ba146603b6ea6fe9b5a06
--- /dev/null
+++ b/components/copresence/proto/push_message.proto
@@ -0,0 +1,20 @@
+syntax = "proto2";
+package copresence;
+option optimize_for = LITE_RUNTIME;
+import "data.proto";
+message PushMessage {
+  enum Type {
+    TYPE_UNKNOWN = 0;
+    SYNC_SETTINGS = 3;
+    OBTAIN_MAC = 5;
+    NOTIFY_MAC = 6;
+    TEST = 7;
+    REPORT = 8;
+  };
+  optional Type type = 1;
+  optional Report report = 9;
+}
+message Report {
+  repeated Directive directive = 1;
+  repeated SubscribedMessage subscribed_message = 2;
+}