https://bugs.webkit.org/show_bug.cgi?id=88787

Source/JavaScriptCore:

Re-export WTF::MediaTime from JavaScriptCore.

Reviewed by Eric Carlson.

* JavaScriptCore.order:
* JavaScriptCore.vcproj/JavaScriptCore/JavaScriptCore.def:

Source/WTF:

Reviewed by Eric Carlson.

Add a new MediaTime class which implements rational math operations.

Add common constructors and assignment operators:
* wtf/MediaTime.cpp: Added.
(WTF::MediaTime::MediaTime):
(WTF::MediaTime::~MediaTime):
(WTF::MediaTime::operator=):

Add common math operators:
* wtf/MediaTime.cpp:
(WTF::MediaTime::operator+):
(WTF::MediaTime::operator-):
(WTF::MediaTime::operator<):
(WTF::MediaTime::operator>):
(WTF::MediaTime::operator==):
(WTF::MediaTime::operator>=):
(WTF::MediaTime::operator<=):

Add functions to check the MeiaTime time type flags:
* wtf/MediaTime.h:
(WTF::MediaTime::isValid):
(WTF::MediaTime::isInvalid):
(WTF::MediaTime::hasBeenRounde):
(WTF::MediaTime::isPositiveInfinite):
(WTF::MediaTime::isNegativeInfinite):
(WTF::MediaTime::isIndefinite):

Add constants for commonly used MediaTime values:
(WTF::MediaTime::zeroTime):
(WTF::MediaTime::invalidTime):
(WTF::MediaTime::positiveInfiniteTime):
(WTF::MediaTime::negativeInfiniteTime):
(WTF::MediaTime::indefiniteTime):

Add explicit conversion functions to convert to and from floating point values.
* wtf/MediaTime.cpp:
(WTF::MediaTime::createWithFloat):
(WTF::MediaTime::createWithDouble):
(WTF::MediaTime::toFloat):
(WTF::MediaTime::toDouble):

Add some useful exported functions:
* wtf/MediaTime.cpp:
(WTF::MediaTime::compare): Master function for the comparison operators above.
(WTF::MediaTime::setTimeScale): Rescale the time value to a new time scale.
(WTF::abs): Return an absolute value for the current MediaTime.

Static utility functions to implement the above:
* wtf/MediaTime.cpp:
(WTF::greatestCommonDivisor):
(WTF::leastCommonMultiple):
(WTF::signum):

Windows-only implementations of isinf and signbit:
* wtf/MediaTime.cpp:
(std::isinf):
(std::signbit):

Add the new class to platform build files:
* GNUmakefile.list.am:
* WTF.gypi:
* WTF.pro:
* WTF.vcproj/WTF.vcproj:
* WTF.xcodeproj/project.pbxproj:

Tools:

Add unit tests for the WTF::MediaTime class.

Reviewed by Eric Carlson.

* TestWebKitAPI/GNUmakefile.am:
* TestWebKitAPI/TestWebKitAPI.gypi:
* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* TestWebKitAPI/Tests/WTF/MediaTime.cpp: Added.
* TestWebKitAPI/win/TestWebKitAPI.vcproj:
(WTF::operator<<):
(TestWebKitAPI):
(TestWebKitAPI::TEST):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@123878 268f45cc-cd09-0410-ab3c-d52691b4dbfc