[texmap] Rename TextureMapperGL::ClipStack::init to reset
https://bugs.webkit.org/show_bug.cgi?id=110783

Reviewed by Noam Rosenthal.

Functions named init() are usually called inside ctor's to initialize
member variables that were unable to be assigned on an initialization
list, which is not the case, and also because reset() better reflects
the behavior (clears the clip stack and assigns a value to the initial
clip state).

No behavior changes, thus covered by existing tests.

* platform/graphics/texmap/TextureMapperGL.cpp:
(WebCore::TextureMapperGL::ClipStack::reset):
(WebCore::TextureMapperGL::beginPainting):
(WebCore::BitmapTextureGL::initializeDepthBuffer):
* platform/graphics/texmap/TextureMapperGL.h:
(ClipStack):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144003 268f45cc-cd09-0410-ab3c-d52691b4dbfc