Relanding: Add js api for hosted/packaged apps to request notification authorization

chrome/common/extensions/extension_messages.h

Index: chrome/common/extensions/extension_messages.h
diff --git a/chrome/common/extensions/extension_messages.h b/chrome/common/extensions/extension_messages.h
index cb22831a5468b33a44e379356d67d708059920b8..9a5da31cb3e0217076be53e3656d407f1a6e08ea 100644
--- a/chrome/common/extensions/extension_messages.h
+++ b/chrome/common/extensions/extension_messages.h
@@ -324,6 +324,19 @@ IPC_MESSAGE_ROUTED3(ExtensionMsg_InlineWebstoreInstallResponse,
                     bool /* whether the install was successful */,
                     std::string /* error */)
 
+// Sent by the renderer when an App is requesting permission to send server
+// pushed notifications.
+IPC_MESSAGE_ROUTED3(ExtensionHostMsg_GetAppNotifyChannel,
+                    int32 /* request_id */,
+                    GURL /* requestor_url */,
+                    std::string /* client_id */)
+
+// Response to the renderer for the above message.
+IPC_MESSAGE_ROUTED3(ExtensionMsg_GetAppNotifyChannelResponse,
+                    int32 /* request_id */,
+                    std::string /* channel_id */,
+                    std::string /* error */)
+
 // Deliver a message sent with ExtensionHostMsg_PostMessage.
 IPC_MESSAGE_ROUTED2(ExtensionMsg_DeliverMessage,
                     int /* target_port_id */,