GPU: Factory produces APTManagers instead of APTDelegates

GPU: Factory produces APTManagers instead of APTDelegates

First step of a larger refactor to push some of the logic from the
AsyncPixelTransferDelegate to the AsyncPixelTransferManager. This
CL moves a lot of files (async_pixel_transfer_delegate_* -->
async_pixel_transfer_manager_*) and introduces some Manager wrappers.
There is no functional change.

BUG=240504
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=204017

[jonathan.backer, 2013-06-03 21:11:27]

Keeping it small to make it easier to review.

The next step is to move 

  virtual void BindCompletedAsyncTransfers() = 0;
  virtual uint32 GetTextureUploadCount() = 0;
  virtual base::TimeDelta GetTotalTextureUploadTime() = 0;
  virtual void ProcessMorePendingTransfers() = 0;
  virtual bool NeedsProcessMorePendingTransfers() = 0;

to the Manager. If you want I can proxy those calls from the Manager to the
Delegate that it holds.

[piman, 2013-06-03 21:23:18]

lgtm

[commit-bot: I haz the power, 2013-06-04 12:51:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/backer@chromium.org/16325018/1

[commit-bot: I haz the power, 2013-06-04 19:30:10]

Change committed as 204017