[M56] Consolidate how ImageDocument sets image styling

[M56] Consolidate how ImageDocument sets image styling

* Consolidate how the image sets the cursor styling inside of
  updateImageStyle(), which now checks for whether the cursor
  or checkerboard size has changed during styling updates.

* Fix how the magnifying glass cursor is initialized on desktop
  versions of the page.

BUG=664782
TBR=pdr@chromium.org

Original-Review-Url: https://codereview.chromium.org/2523553002
Original-Cr-Commit-Position: refs/heads/master@{#434020}
Committed: https://chromium.googlesource.com/chromium/src/+/c45131ad8acfc30cf22e7113a8029d26f7ec4bb8

[gone, 2016-11-28 21:08:46]

Description was changed from

==========
[M56] Consolidate how ImageDocument sets image styling

* Consolidate how the image sets the cursor styling inside of
  updateImageStyle(), which now checks for whether the cursor
  or checkerboard size has changed during styling updates.

* Fix how the magnifying glass cursor is initialized on desktop
  versions of the page.

BUG=664782
TBR=pdr@chromium.org

Original-Review-Url: https://codereview.chromium.org/2523553002
Original-Cr-Commit-Position: refs/heads/master@{#434020}
==========

to

==========
[M56] Consolidate how ImageDocument sets image styling

* Consolidate how the image sets the cursor styling inside of
  updateImageStyle(), which now checks for whether the cursor
  or checkerboard size has changed during styling updates.

* Fix how the magnifying glass cursor is initialized on desktop
  versions of the page.

BUG=664782
TBR=pdr@chromium.org

Original-Review-Url: https://codereview.chromium.org/2523553002
Original-Cr-Commit-Position: refs/heads/master@{#434020}
Committed:
https://chromium.googlesource.com/chromium/src/+/c45131ad8acfc30cf22e7113a802...
==========

[gone, 2016-11-28 21:08:48]

Committed patchset #1 (id:1) manually as
c45131ad8acfc30cf22e7113a8029d26f7ec4bb8.