Revert "Remove "content" rect from GrTextureAdjuster."

This reverts commit 6e4bbbefe153495cf34ea42aa72691756e6ab40e.

Reason for revert: assertion failure

Original change's description:
> Remove "content" rect from GrTextureAdjuster.
> 
> Since we got rid of texture-backed bitmaps this is no longer required.
> 
> Change-Id: Id15c745994a3d6a1489e193b5d29916fa0931264
> Reviewed-on: https://skia-review.googlesource.com/36340
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

TBR=bsalomon@google.com,robertphillips@google.com

Change-Id: I2229ec05079368ff196ff351107f88062080e5ec
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/43720
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
10 files changed