Fix UI glitches on Performance and Memory panels

Fix UI glitches on Performance and Memory panels

Network pane font was inconsistent.
Target select combobox on Memory panel had no padding.
Default tree view height was too small.

BUG=682892
Review-Url: https://codereview.chromium.org/2640403003
Cr-Original-Commit-Position: refs/heads/master@{#444959}
Committed: https://chromium.googlesource.com/chromium/src/+/5ffeda5222ba52d797c90dd247be0113c0ced577
Review-Url: https://codereview.chromium.org/2640403003
Cr-Commit-Position: refs/heads/master@{#445249}
(cherry picked from commit 2d74d5b6592b0cef8b085bfa07711473dfae707f)

Review-Url: https://codereview.chromium.org/2655793002 .
Cr-Commit-Position: refs/branch-heads/2987@{#76}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/24a8c564ad4579613a1f02dd7148625ff17b8526

[alph, 2017-01-24 22:55:03]

Description was changed from

==========
Fix UI glitches on Performance and Memory panels

Network pane font was inconsistent.
Target select combobox on Memory panel had no padding.
Default tree view height was too small.

BUG=682892

Review-Url: https://codereview.chromium.org/2640403003
Cr-Original-Commit-Position: refs/heads/master@{#444959}
Committed:
https://chromium.googlesource.com/chromium/src/+/5ffeda5222ba52d797c90dd247be...
Review-Url: https://codereview.chromium.org/2640403003
Cr-Commit-Position: refs/heads/master@{#445249}
(cherry picked from commit 2d74d5b6592b0cef8b085bfa07711473dfae707f)
==========

to

==========
Fix UI glitches on Performance and Memory panels

Network pane font was inconsistent.
Target select combobox on Memory panel had no padding.
Default tree view height was too small.

BUG=682892

Review-Url: https://codereview.chromium.org/2640403003
Cr-Original-Commit-Position: refs/heads/master@{#444959}
Committed:
https://chromium.googlesource.com/chromium/src/+/5ffeda5222ba52d797c90dd247be...
Review-Url: https://codereview.chromium.org/2640403003
Cr-Commit-Position: refs/heads/master@{#445249}
(cherry picked from commit 2d74d5b6592b0cef8b085bfa07711473dfae707f)

Review-Url: https://codereview.chromium.org/2655793002 .
Cr-Commit-Position: refs/branch-heads/2987@{#76}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/24a8c564ad4579613a1f02dd7148...
==========

[alph, 2017-01-24 22:55:05]

Committed patchset #1 (id:1) manually as
24a8c564ad4579613a1f02dd7148625ff17b8526.