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[Public WebGL] Demos and spec updated for new viewport resizing behavior


Following on to the thread "WebGL back buffer contents", the WebGL
demos linked from http://khronos.org/webgl/wiki/Demo_Repository have
been updated to set the OpenGL viewport manually. A new subsection 2.3
has been added to the WebGL specification explicitly stating that the
OpenGL viewport is not changed when the canvas's size changes, and
that the initial viewport's origin is (0, 0) with size (0, 0). The
tests under sdk/tests/fast have been updated as necessary and new
expected.txt files created for the new tests. The associated Khronos
bug (http://www.khronos.org/bugzilla/show_bug.cgi?id=245) has been
marked fixed.

The WebKit WebGL implementation has been updated to take these new
rules into account. The changes should show up in the WebKit nightly
builds and Chromium continuous builds soon.

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