This combo can be a pain, much like any other double DPS team. Start off by running up to a pillar, and dropping a Snake or Frost Trap and a Flare. Both you and your Druid need to be sitting in your flare, and you need to maintain the flare. Try to spot the Rogue using Track Hidden, but don't move outside of your flare. They will usually come at you relatively quickly once the match starts, because if they don't you can get Shadowsight and pop the Rogue out of stealth.

It is completely essential that the Rogue does not get an opener on your Druid. Once the Mage starts approaching you, put a Viper Sting up on him, and continue to do so every 15 seconds. If they attempt to kill you, you'll just need to avoid all of the Mages damage while picking away at the Rogue by getting away via Abolish Poison and draining the Mage's mana. If you survive about a minute in this fashion, you will have won the game because you survived the rogues cooldowns. Kill the Water Elemental if you can.

Always kill the rogue first in every DPS + Rogue team.

If they attempt to go on your Druid, which they probably will, you do the same thing, except you're able to open up on the Rogue. You have to avoid all Polymorphs through LoS and Silencing Shot. Save your Scatter Shot for the Rogue only, and use it to either help your Druid get distance on the Rogue, or during 5 second Kidney Shots. Save your trinket for the Blind, and do not get Polymorped.

If they go on your Druid, keep the Rogue Wing Clipped the entire game. If your Druid looks like he might be in trouble, go in and spam Wing Clip on the Rogue trying to get Improved Wing Clip procs. Also, drop a Frost Trap for your Druid to kite through. A good tip is for him to Feral Charge through a Frost Trap at the Mage on the other side, away from the Rogue, and Travel Form away while you beat on the rogue.

If they are on you, and the Shadowsight buffs come up mid-game, have your Druid get one so he doesn't get blinded.

Don't forget that you have flares. Always keep flares up in front of where your Druid is kiting, or even right on top of him. If you can negate a Vanish opener, or a Rogue escape, you've done a very valuable thing.

Druid's Perspective
The easiest of the double DPS teams. You don't know which target they're going to go for, so always be careful at the start. At the beginning, if you pop out before their Rogue opens, you need to Abolish and HoT yourself preemptively before then switching to Abolish/HoT your Hunter. This way, if the Rogue is waiting for you so he can open on you, you already have HoT's/abolish rolling and you can survive the first stun lock without using your trinket.

If they are on the hunter:
Make sure to LOS the Mage in this so you can avoid Counterspells. Abolish Poison is the most important thing - keep it up. My personal rotation goes Abolish-Lifebloom->Rejuv(swiftmend if needed)->Lifebloom->Rejuv>Abolish->Lifebloom.

If you're 100% certain you're out of the Mage's LOS (and will be out of his LOS for the entire duration of the cast), Cyclone/Root the Rogue to give your Hunter more breathing room. Other than that, Watch the Mage's elemental, when it goes up it means they're going to shatter combo, so do a preemptive Rejuv for a Swiftmend. Other than that, keep the full Lifeblooms rolling always, and you can usually win.

If you can pick up Shadowsight, it will break the Rogue's Blinds, so always try to pick it up so you can save your trinket.

They are on you:
Stay on the Frost Trap and kite around a pillar. Your hunter should be helping with Wing Clips if they're next to him, but really you shouldn't have too much of a problem.

When you pop out to heal the Hunter, make sure to HoT yourself first, then him. The Rogue will open on you, and your Hunter needs to Scatter Shot him and Silence the Mage when he's about to cast his Frostbolt Shatter Combo. In this fight, you need to either kite across the Frost Trap or pillar kite. I prefer Pillar kiting because for me it's safer, but some other people prefer Frost Trap kiting because it lets their Hunter help more and it also lets him beat on the Rogue. It's all personal preference.

Try to delay the start of the fight as long as you can. If your Hunter can pick up the Shadowsight buff, it will break his Polymorph's so he can save his trinket for the Blind.

Talk to your Hunter about positioning. The ultimate goal is where you are around a pillar, in LOS of your Hunter/their Rogue so you can CC the Rogue and heal your Hunter, while out of LOS of the Mage to avoid the Counterspells.