PictureLayerImplTests: Start frame time ticks at 1 millisecond.

LTHI does not treat 0 as a valid time tick, instead it
will use gfx::FrameTime::Now().

Start frame time ticks at 1 millisecond so that LTHI does not use gfx::FrameTime::Now().

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287641

[hush (inactive), 2014-08-05 19:36:51]

I didn't increase the time ticks after SetupDrawPropertiesAndUpdateTiles() for
those tests, but the tests still pass.

These tests are not testing for properties that require the frame time to be
ticked.
For example, InvalidViewportForPrioritizingTiles tries to test if
"visible_rect_for_tile_priority" gets updated. visible_rect_for_tile_priority
will be updated whenever you call active_layer_->UpdateTiles(NULL), regardless
of what the current frame time tick is.

[aelias_OOO_until_Jul13, 2014-08-05 20:19:00]

lgtm, thanks for the cleanup.

[hush (inactive), 2014-08-05 20:37:19]

The CQ bit was checked by hush@chromium.org

[commit-bot: I haz the power, 2014-08-05 20:38:10]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hush@chromium.org/438373002/1

[commit-bot: I haz the power, 2014-08-05 23:32:42]

Change committed as 287641