Gallery2: Reginal requirement for RTL

Add RTL logic in load picture, pick picture, show picture, delete
picture, load album, pick album, show album, show widget, pick
widget, scroll timebar. Change Camera setting to support RTL.

Change-Id: Ica264f624e0f20153280066264943882ad22f2db
Gallery2: Cropped video seek bar pointer.

Modify time bar layout to make it show completely.

Change-Id: Id3c61db55e2c92696babe38bf9cc8f94c32459ce
CRs-Fixed: 737809
Gallery2: Make icon display completely.

The icon size is to big for the device screen.

Adjust the icon size to the right width.

CRs-fixed: 639562

Change-Id: Ibde082d48d4f12009f5293de049798cf221adda4