Split EGLContext in GLContextEGL and GLSurfaceEGL.

Split EGLContext in GLContextEGL and GLSurfaceEGL.

Surfaces are independent of contexts in GL. To facilitate sharing of surfaces between processes, I have separated them from the notion of contexts because contexts cannot be shared between processes.

I have started with EGL. GLContextEGL still has a pointer to a surface and still has some surface specific operations that just forward through to it. Once I have refactored all the GLContext implementations in this way, I will remove these pointers and the surface specific opertations.

There will not be "view" and "offscreen" GL contexts. Rather there will be a single context type for each backend which can be made current with a surface that directs output either to a view or offscreen surface.

TEST=try, WebGL puppy works
BUG=none
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=81512

[apatrick_chromium, 2011-04-13 22:17:39]

Running by trybots now...

[Alexey Marinichev, 2011-04-13 23:45:07]

http://codereview.chromium.org/6839008/diff/8001/ui/gfx/gl/gl_surface_egl.h
File ui/gfx/gl/gl_surface_egl.h (right):

http://codereview.chromium.org/6839008/diff/8001/ui/gfx/gl/gl_surface_egl.h#n...
ui/gfx/gl/gl_surface_egl.h:9: #include "base/memory/ref_counted.h"
Should surfaces be refcounted?  If they shouldn't, this include is not needed.

[apatrick_chromium, 2011-04-13 23:51:58]

http://codereview.chromium.org/6839008/diff/8001/ui/gfx/gl/gl_surface_egl.h
File ui/gfx/gl/gl_surface_egl.h (right):

http://codereview.chromium.org/6839008/diff/8001/ui/gfx/gl/gl_surface_egl.h#n...
ui/gfx/gl/gl_surface_egl.h:9: #include "base/memory/ref_counted.h"
On 2011/04/13 23:45:07, Alexey Marinichev wrote:
> Should surfaces be refcounted?  If they shouldn't, this include is not needed.

No that was a hack for windows that is not needed now. Fixed.

[Alexey Marinichev, 2011-04-14 00:00:30]

LGTM