Reland of Add automated testing to check for page size with scaling

Reland of Add automated testing to check for page size with scaling (patchset #1 id:1 of https://codereview.chromium.org/2718513003/ )

Reason for revert:
Turns out the original CL was not the cause of the flakiness.

Original issue's description:
> Revert of Add automated testing to check for page size with scaling (patchset #4 id:60001 of https://codereview.chromium.org/2697683004/ )
> 
> Reason for revert:
> Looks like this causes build bot errors: crbug.com/695760
> 
> Original issue's description:
> > Add automated testing to check for page size with scaling
> > 
> > Ensure correct page size is still passed back with non default scaling
> > values - see bug 686384. Also, modify print web view helper to prevent
> > any rounding errors from converting dpi -> pixels -> dpi and scaling
> > and unscaling.
> > 
> > BUG=686384
> > 
> > Review-Url: https://codereview.chromium.org/2697683004
> > Cr-Commit-Position: refs/heads/master@{#452737}
> > Committed: https://chromium.googlesource.com/chromium/src/+/230c3f1c820ccb738e9715cd45b2b5e049d782d7
> 
> TBR=thestig@chromium.org,rbpotter@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=686384
> 
> Review-Url: https://codereview.chromium.org/2718513003
> Cr-Commit-Position: refs/heads/master@{#452763}
> Committed: https://chromium.googlesource.com/chromium/src/+/5378c93cfa61880bb755fff32f231fcf06cc8dd2

TBR=thestig@chromium.org,rbpotter@chromium.org,hajimehoshi@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=686384
Review-Url: https://codereview.chromium.org/2719443003
Cr-Commit-Position: refs/heads/master@{#452801}
Committed: https://chromium.googlesource.com/chromium/src/+/b79284c64bbefedf7b9eee4caf42f47f38316733

[Marc Treib, 2017-02-24 12:53:42]

The CQ bit was checked by treib@chromium.org

[Marc Treib, 2017-02-24 12:53:43]

Created Reland of Add automated testing to check for page size with scaling

[commit-bot: I haz the power, 2017-02-24 12:54:08]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-02-24 12:55:18]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487940822818630, "parent_rev":
"0fc562c98c420de40daa775a1aacb52a4760a9b4", "commit_rev":
"b79284c64bbefedf7b9eee4caf42f47f38316733"}

[commit-bot: I haz the power, 2017-02-24 12:55:58]

Description was changed from

==========
Reland of Add automated testing to check for page size with scaling (patchset #1
id:1 of https://codereview.chromium.org/2718513003/ )

Reason for revert:
Turns out the original CL was not the cause of the flakiness.

Original issue's description:
> Revert of Add automated testing to check for page size with scaling (patchset
#4 id:60001 of https://codereview.chromium.org/2697683004/ )
> 
> Reason for revert:
> Looks like this causes build bot errors: crbug.com/695760
> 
> Original issue's description:
> > Add automated testing to check for page size with scaling
> > 
> > Ensure correct page size is still passed back with non default scaling
> > values - see bug 686384. Also, modify print web view helper to prevent
> > any rounding errors from converting dpi -> pixels -> dpi and scaling
> > and unscaling.
> > 
> > BUG=686384
> > 
> > Review-Url: https://codereview.chromium.org/2697683004
> > Cr-Commit-Position: refs/heads/master@{#452737}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/230c3f1c820ccb738e9715cd45b2...
> 
> TBR=thestig@chromium.org,rbpotter@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=686384
> 
> Review-Url: https://codereview.chromium.org/2718513003
> Cr-Commit-Position: refs/heads/master@{#452763}
> Committed:
https://chromium.googlesource.com/chromium/src/+/5378c93cfa61880bb755fff32f23...

TBR=thestig@chromium.org,rbpotter@chromium.org,hajimehoshi@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=686384
==========

to

==========
Reland of Add automated testing to check for page size with scaling (patchset #1
id:1 of https://codereview.chromium.org/2718513003/ )

Reason for revert:
Turns out the original CL was not the cause of the flakiness.

Original issue's description:
> Revert of Add automated testing to check for page size with scaling (patchset
#4 id:60001 of https://codereview.chromium.org/2697683004/ )
> 
> Reason for revert:
> Looks like this causes build bot errors: crbug.com/695760
> 
> Original issue's description:
> > Add automated testing to check for page size with scaling
> > 
> > Ensure correct page size is still passed back with non default scaling
> > values - see bug 686384. Also, modify print web view helper to prevent
> > any rounding errors from converting dpi -> pixels -> dpi and scaling
> > and unscaling.
> > 
> > BUG=686384
> > 
> > Review-Url: https://codereview.chromium.org/2697683004
> > Cr-Commit-Position: refs/heads/master@{#452737}
> > Committed:
https://chromium.googlesource.com/chromium/src/+/230c3f1c820ccb738e9715cd45b2...
> 
> TBR=thestig@chromium.org,rbpotter@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=686384
> 
> Review-Url: https://codereview.chromium.org/2718513003
> Cr-Commit-Position: refs/heads/master@{#452763}
> Committed:
https://chromium.googlesource.com/chromium/src/+/5378c93cfa61880bb755fff32f23...

TBR=thestig@chromium.org,rbpotter@chromium.org,hajimehoshi@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=686384

Review-Url: https://codereview.chromium.org/2719443003
Cr-Commit-Position: refs/heads/master@{#452801}
Committed:
https://chromium.googlesource.com/chromium/src/+/b79284c64bbefedf7b9eee4caf42...
==========

[commit-bot: I haz the power, 2017-02-24 12:55:59]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b79284c64bbefedf7b9eee4caf42...