Revert "Reland "Do not use sub-pixel positioning for source space""

This reverts commit 8aa0ea04ba8d1fd54f79258bac93f878b70bd1ed.

Reason for revert: Breaks win7 SVG positioning tests

Original change's description:
> Reland "Do not use sub-pixel positioning for source space"
> 
> This reverts commit d9b8eed84814a85509f7f7d6c0894199b4183eb5.
> 
> Reason for revert: This does not seem to change anything in gold
> 
> Original change's description:
> > Revert "Do not use sub-pixel positioning for source space"
> > 
> > This reverts commit 7b56b0ae3947eb0f9a782a2dc2c4145ef39644b9.
> > 
> > Reason for revert: speculative: broke win7 layout tests
> > 
> > Original change's description:
> > > Do not use sub-pixel positioning for source space
> > > 
> > > Since the source space drawing modes call getGlyphMetrics with
> > > the point {0, 0}, just turn of sub-pixel positioning. This uses
> > > a more efficient code path in the strike
> > > 
> > > Change-Id: I360f56e1eede776dfa82db6b780b88c1fda50d36
> > > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206701
> > > Reviewed-by: Ben Wagner <bungeman@google.com>
> > > Commit-Queue: Ben Wagner <bungeman@google.com>
> > > Commit-Queue: Herb Derby <herb@google.com>
> > > Auto-Submit: Herb Derby <herb@google.com>
> > 
> > TBR=bungeman@google.com,herb@google.com
> > 
> > Change-Id: I06cafe542fe6374d1a273db09617dbebd9eb04c7
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206696
> > Reviewed-by: Mike Reed <reed@google.com>
> > Commit-Queue: Mike Reed <reed@google.com>
> 
> TBR=bungeman@google.com,herb@google.com,reed@google.com
> 
> Change-Id: I44ed127ee1e7494c8959b66d25654b3393e99b27
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206901
> Reviewed-by: Herb Derby <herb@google.com>
> Commit-Queue: Herb Derby <herb@google.com>

TBR=bungeman@google.com,herb@google.com,reed@google.com

Change-Id: I24ce322fa5bc285bf0fc1e0687490fa3971b291f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206713
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
3 files changed