Mojo JS Bindings: added unit tests for int/uint values

Mojo JS Bindings: added unit tests for int/uint values

Just a pair of tests for all of the Mojo integer types.

BUG=
R=abarth@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/237972f8e68244b2685d237cf70e750bed73dd2e

[hansmuller1, 2014-12-30 00:46:13]

hansmuller@google.com changed reviewers:
+ esprehn@chromium.org

[hansmuller1, 2014-12-30 00:52:30]

hansmuller@google.com changed reviewers:
+ hansmuller@google.com

[hansmuller1, 2014-12-30 00:52:30]

If you have a chance, PTAL.

[abarth-chromium, 2014-12-30 08:35:53]

abarth@chromium.org changed reviewers:
+ abarth@chromium.org

[abarth-chromium, 2014-12-30 08:35:54]

lgtm

[hansmuller, 2014-12-30 15:51:02]

Committed patchset #2 (id:20001) manually as
237972f8e68244b2685d237cf70e750bed73dd2e (presubmit successful).

[dcheng, 2014-12-30 19:10:14]

dcheng@chromium.org changed reviewers:
+ dcheng@chromium.org

[dcheng, 2014-12-30 19:10:15]

MSVC is unhappy with this patch:

e:\b\build\slave\win\build\src\out\release\gen\mojo\public\interfaces\bindings\tests\test_structs.mojom.cc(1437)
: error C2220: warning treated as error - no 'object' file generated
e:\b\build\slave\win\build\src\out\release\gen\mojo\public\interfaces\bindings\tests\test_structs.mojom.cc(1437)
: warning C4146: unary minus operator applied to unsigned type, result still
unsigned

The problematic line is:
const int32_t IntegerNumberValues::V10 = -2147483648;

Per http://msdn.microsoft.com/en-us/library/4kh09110.aspx, the reason for this
is:

Practically, this occurs when the programmer is trying to express the minimum
integer value, which is -2147483648. This value cannot be written as -2147483648
because the expression is processed in two stages:
1. The number 2147483648 is evaluated. Because it is greater than the maximum
integer value of 2147483647, the type of 2147483648 is not int, but unsigned
int.
2. Unary minus is applied to the value, with an unsigned result, which also
happens to be 2147483648.

Yay...