Support size_t multiplication and division operators on LayoutUnit
https://bugs.webkit.org/show_bug.cgi?id=83848

Reviewed by Emil A Eklund.

Source/WebCore:

Per Darin's suggestion, adding a version of the operator for most unsigned types (excluding
only unsigned char). This should automatically cover size_t as it should be one of these.

Test: TestWebKitAPI/Tests/WebCore/LayoutUnit.cpp

* platform/LayoutUnit.h:
(WebCore::LayoutUnit::LayoutUnit):
(WebCore::operator*):
(WebCore::operator/):
Added the operators and (possibly saturating) constructors for unsigned short, unsigned long,
unsigned long long.

Tools:

* TestWebKitAPI/Tests/WebCore/LayoutUnit.cpp:
Added some simple tests for the new operators using size_t.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138952 268f45cc-cd09-0410-ab3c-d52691b4dbfc