12:58pm: In addition to Jones and Hartline, the Chargers are also working out Lance Moore, according to Michael Gehlken of the San Diego Union-Tribune.
Moore hooked on with the Lions last year and hauled in 29 passes for 337 yards and four touchdowns. In the year prior, he was used sparingly as a member of the Steelers. Moore spent the 2006-2013 with the Saints, where he was often a key contributor in their offense.
9:36am: The Chargers are hosting veteran wide receiver James Jones on a visit today, a source tells Ian Rapoport of NFL.com (on Twitter). San Diego will also work out Brian Hartline, Rapoport adds (Twitter link). 
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As Stevie Johnson deals with a knee injury, the Chargers are looking for an experienced fill-in to help round out their group of receivers. As shown on Roster Resource, Johnson is slated to work behind Keenan Allen and offseason pickup Travis Benjamin in the club’s wideout pecking order, but an ACL issue has put his season in jeopardy. The Bolts also have Tyrell Williams, Dontrelle Inman, Javontee Herndon, Torrence Allen, and Isaiah Burse on the depth chart, though none of those players offer a resume like that of Jones or Hartline. In his first year with the Bolts, Johnson battled injuries and posted respectable production in 10 games, racking up 45 catches on 65 targets for 497 yards and three touchdowns.
In June, Jones said that he would “love” to join the 49ers, though he acknowledged that he was not in a position to be choosy. Jones led the Packers in 2015 with 890 receiving yards off of 50 receptions. He also led Green Bay’s wide receivers with eight touchdowns. That was a different stat line than 2014, a year in which he corralled a career-high 73 receptions for just 666 yards and six touchdowns for the Raiders.
Hartline, 29, suffered a broken collarbone during a December win over the 49ers and immediately underwent surgery to correct the issue. This offseason, the Browns released him. The local product, who played his college ball at Ohio State, finished his first and only season in Cleveland with 46 catches, 523 yards, and a pair of touchdowns. There hasn’t been much interest in Hartline since he was cut loose in March.
Photo courtesy of USA Today Sports Images.