preparation for experimenting with them to gpu-accelerate various aspects of
chrome's drawing. In this initial patch, the files will be built, but not
called.

Now with dependency on gpu lib for sharedlib build on linux

TEST=be sure that page rendering, and <canvas> rendering, look the same as before

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=71998

Review URL: http://codereview.chromium.org/6357006
Patch from Mike Reed <reed@google.com>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@72103 0039d316-1c4b-4281-b951-d872f2087c98