Gallery2: Fix photo widget display black when no picutures.

The color of "No photos" is same with its background which make
the text of "No photos" not display.

Modify the color of text to make "No pictures" display

CRs-Fixed: 752380

Change-Id: Iba4ea3085528199faddb39f55e7383f910440526
Revert "Gallery2: reduce post delay time"

This reverts commit a062a4a3b567553622aa1e3b4de393917225b8b3.

CRs-Fixed: 756218
Change-Id: I22eee7e21b0eb4a7900ae7db886b9a3cab56fe23
Gallery2: Set default value for server timeout

The timeout of server is not set when read from flag of SERVER_TIMEOUT,
the value will stay to be -1, as a result there will be no resume dialog

Set a default value of 3 min for resume timeout

CRs-Fixed: 753834

Change-Id: Icd4640c4b56a64857dfade1bb8d7a3581494d404