clutter-cairo-texture: Use the new cogl_pixel_buffer API
clutter-cairo-texture: Use the new cogl_pixel_buffer API

ClutterCairoTexture now stores the surface image data in a Cogl pixel
buffer object. When clutter_cairo_texture_create is called the buffer
is mapped and a new Cairo surface is created to render directly to the
PBO. When the surface is destroyed the buffer is unmapped and a Cogl
texture is recreated from the buffer. This should enable slightly
faster uploads when using Cairo because it avoids having to copy the
surface data to the texture.

http://bugzilla.openedhand.com/show_bug.cgi?id=1982

Signed-off-by: Emmanuele Bassi <049ee2061f71220e5aaf33f5be422fc2a2b06a44@linux.intel.com>

Distrotech/clutter,collects/clutter,jigpu/clutter,djdeath/clutter-android,rkudiyarov/clutter_osx,dlespiau/clutter,kerrickstaley/clutter-vala,nobled/clutter,djdeath/clutter-multithreaded,nobled/clutter,ebassi/clutter,kerrickstaley/clutter-vala,ebassi/clutter,spatulasnout/clutter,jigpu/clutter,djdeath/clutter,dlespiau/clutter,rkudiyarov/clutter_osx,rkudiyarov/clutter_osx,djdeath/clutter-android,Distrotech/clutter,collects/clutter,nobled/clutter,djdeath/clutter-android,spatulasnout/clutter,ebassi/clutter,GNOME/clutter,djdeath/clutter,spatulasnout/clutter,GNOME/clutter,djdeath/clutter-multithreaded,kerrickstaley/clutter-vala,GNOME/clutter,djdeath/clutter-multithreaded,GNOME/clutter,spatulasnout/clutter,ebassi/clutter,djdeath/clutter-multithreaded,Distrotech/clutter,Distrotech/clutter,collects/clutter,heysion/clutter-clone,jigpu/clutter,djdeath/clutter,kerrickstaley/clutter-vala,collects/clutter,jigpu/clutter,GNOME/clutter,djdeath/clutter-android,rkudiyarov/clutter_osx,Distrotech/clutter,djdeath/clutter,jigpu/clutter,dlespiau/clutter,heysion/clutter-clone,heysion/clutter-clone,djdeath/clutter-android,djdeath/clutter,heysion/clutter-clone,heysion/clutter-clone,spatulasnout/clutter,ebassi/clutter,jigpu/clutter,collects/clutter,djdeath/clutter,Distrotech/clutter