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around. Both only occurred when the active tab width differs from
inactive tab width (lots-o-tabs).
. ResizeLayoutTabs() had an optimization that avoided doing anything
  if the width of the first tab hasn't changed. Problems is if the
  first tab is active and inactive tabs have a smaller width than
  active tabs than the width won't have changed but we still need to
  layout. I removed the optimization.
. If selecting a tab triggers a bounds change the coordinates used by
  tab dragging would be wrong (because they extract them from the
  event, which is in the original coordinates).
. Needed to tweak rtl code.

BUG=140747
TEST=see bug, but make sure no weird behavior with tab selection/dragging on
windows/chrome-os.
R=ben@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11821036

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175991 0039d316-1c4b-4281-b951-d872f2087c98