[Media>UI] Don't scale the icon if it's smaller than the ideal size

[Media>UI] Don't scale the icon if it's smaller than the ideal size

Previously we scale favicons or media artwork images to the ideal
size regardless of their original size. This increases the memory
usage as we create another copy of the original image and the
size will also be increased if the original image size is smaller
than the ideal size.

In this CL, if the original image size is smaller than the ideal
size, we will reuse the original image and won't scale it
anymore.

BUG=682701
Review-Url: https://codereview.chromium.org/2641133004
Cr-Commit-Position: refs/heads/master@{#445147}
(cherry picked from commit c3a579962e733b26ef12f564732260844d558a56)

Review-Url: https://codereview.chromium.org/2649173002 .
Cr-Commit-Position: refs/branch-heads/2987@{#27}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/3c4aff3e70f102ba1f911d060e3c554ac8812f17

[Zhiqiang Zhang (Slow), 2017-01-23 16:48:57]

Description was changed from

==========
[Media>UI] Don't scale the icon if it's smaller than the ideal size

Previously we scale favicons or media artwork images to the ideal
size regardless of their original size. This increases the memory
usage as we create another copy of the original image and the
size will also be increased if the original image size is smaller
than the ideal size.

In this CL, if the original image size is smaller than the ideal
size, we will reuse the original image and won't scale it
anymore.

BUG=682701

Review-Url: https://codereview.chromium.org/2641133004
Cr-Commit-Position: refs/heads/master@{#445147}
(cherry picked from commit c3a579962e733b26ef12f564732260844d558a56)
==========

to

==========
[Media>UI] Don't scale the icon if it's smaller than the ideal size

Previously we scale favicons or media artwork images to the ideal
size regardless of their original size. This increases the memory
usage as we create another copy of the original image and the
size will also be increased if the original image size is smaller
than the ideal size.

In this CL, if the original image size is smaller than the ideal
size, we will reuse the original image and won't scale it
anymore.

BUG=682701

Review-Url: https://codereview.chromium.org/2641133004
Cr-Commit-Position: refs/heads/master@{#445147}
(cherry picked from commit c3a579962e733b26ef12f564732260844d558a56)

Review-Url: https://codereview.chromium.org/2649173002 .
Cr-Commit-Position: refs/branch-heads/2987@{#27}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/3c4aff3e70f102ba1f911d060e3c...
==========

[Zhiqiang Zhang (Slow), 2017-01-23 16:49:00]

Committed patchset #1 (id:1) manually as
3c4aff3e70f102ba1f911d060e3c554ac8812f17.