Add in debugging console.logs which only display if ?debug=true is in URL

services/web/public/coffee/base.coffee

@@ -23,5 +23,9 @@ define [
 			baseUrl: window.sharelatex.sixpackDomain
 			client_id: window.user_id
 		})
+	
+	sl_debugging = window.location?.search?.match(/debug=true/)?
+	window.sl_console =
+		log: (args...) -> console.log(args...) if sl_debugging
 
 	return App

services/web/public/coffee/ide/connection/ConnectionManager.coffee

@@ -61,6 +61,8 @@ define [], () ->
 					if @$scope.state.loading
 						@$scope.state.load_progress = 70
 
+				sl_console.log "[socket.io connect] Connected"
+
 				setTimeout(() =>
 					@joinProject()
 				, 100)
@@ -97,6 +99,7 @@ define [], () ->
 				, 10 * 1000
 				
 		joinProject: () ->
+			sl_console.log "[joinProject] joining..."
 			@ide.socket.emit 'joinProject', {
 				project_id: @ide.project_id
 			}, (err, project, permissionsLevel, protocolVersion) =>

services/web/public/coffee/ide/editor/Document.coffee

@@ -172,14 +172,14 @@ define [
 				update: update
 
 			if window.disconnectOnAck? and Math.random() < window.disconnectOnAck
-				console.log "Disconnecting on ack", update
+				sl_console.log "Disconnecting on ack", update
 				window._ide.socket.socket.disconnect()
 				# Pretend we never received the ack
 				return
 
 			if window.dropAcks? and Math.random() < window.dropAcks
 				if !update.op? # Only drop our own acks, not collaborator updates
-					console.log "Simulating a lost ack", update
+					sl_console.log "Simulating a lost ack", update
 					return
 
 			if update?.doc == @doc_id and @doc?
@@ -194,6 +194,7 @@ define [
 			@doc?.updateConnectionState "disconnected"
 
 		_onReconnect: () ->
+			sl_console.log "[onReconnect] reconnected (joined project)"
 			@ide.pushEvent "reconnected:afterJoinProject"
 
 			@connected = true

services/web/public/coffee/ide/editor/ShareJsDoc.coffee

@@ -29,10 +29,10 @@ define [
 				send: (update) =>
 					@_startInflightOpTimeout(update)
 					if window.disconnectOnUpdate? and Math.random() < window.disconnectOnUpdate
-						console.log "Disconnecting on update", update
+						sl_console.log "Disconnecting on update", update
 						window._ide.socket.socket.disconnect()
 					if window.dropUpdates? and Math.random() < window.dropUpdates
-						console.log "Simulating a lost update", update
+						sl_console.log "Simulating a lost update", update
 						return
 					@socket.emit "applyOtUpdate", @doc_id, update
 				state: "ok"
@@ -95,6 +95,7 @@ define [
 			@_doc.flush()
 
 		updateConnectionState: (state) ->
+			sl_console.log "[updateConnectionState] Setting state to #{state}"
 			@connection.state = state
 			@connection.id = @socket.socket.sessionid
 			@_doc.autoOpen = false