A fix for Issue 18994....

A fix for Issue 18994.
This change retrieves the number of slots available for custom JumpList items to calculate the items for "Most Visited" items and for "Recently Closed" items.
As written in the MSDN doc, Windows 7 changes the number of JumpList slots at run time and it truncates the items from the bottom (i.e. "Recently Closed" items) if we add more items than available ones.
To fix this issue, this change assigned 60% of available JumpList slots to the "Most Visited" category and 40% to the "Recently Closed" category, respectively. (If there are not so many "Recently Closed" Items, this change increases the number of "Most Visited" items.)

Also, this change sets the AppID since <http://codereview.chromium.org/385120>; changes it.

BUG=18994
TEST=Open a JumpList and see there are two or more "Recently Closed" items in it.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=32308

[Ben Goodger (Google), 2009-11-17 18:35:05]

OK