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This converts Linux to using server-side backing stores. Rather than
keeping a backing store in heap memory in the browser, we create a
pixmap in the X server. This means that expose messages don't require
us to transport any images to the X server, we can just direct it to
paint from the pixmap. Also, scrolling can be performed server side
also. This greatly improves performance over remote X.
Also, shared memory transport to the X server is implemented. Shared
memory segments can be created in the renderer and mapped directly
into the X server.
Review URL: http://codereview.chromium.org/27147
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10369 0039d316-1c4b-4281-b951-d872f2087c98
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