Merge 56737 - Fix numerous alignment problems, both horizontal and vertical, ...

Merge 56737 - Fix numerous alignment problems, both horizontal and vertical, in drawing the browser chrome.  This doesn't fix problems with the NTP background image offsets (see bug 51853).

This also makes sure the OTR avatar is reversed in RTL mode, and clipped as usefully as possible when there isn't enough room for the full image.

BUG=44157
TEST=Frame, toolbar, bookmark bar, and find bar all look lined up with default and custom themes, restored and maximized, LTR and RTL, side tabs and normal tabs, and in popup and app windows
Review URL: http://codereview.chromium.org/3137019

TBR=pkasting@chromium.org

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=56753