Use PBuffer to make TextureImageTransportSurface current.

Use offscreen surface to make TextureImageTransportSurface current.

This is a first step to eliminate dependencies on the parent context.
Instead of using the UI context's surface handle, use a 1x1 offscreen surface
to make the renderer's compositor context current. (The actual rendering
goes to FBOs.)


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=157415

[no sievers, 2012-09-18 00:17:01]

Ok, let's see what I can break.

Would something like this work with AURA?

https://codereview.chromium.org/10916355/diff/1/content/common/gpu/texture_im...
File content/common/gpu/texture_image_transport_surface.cc (right):

https://codereview.chromium.org/10916355/diff/1/content/common/gpu/texture_im...
content/common/gpu/texture_image_transport_surface.cc:200: return GetHandle();
Is this only used on Windows?
Should this do NOTREACHED() and return NULL?

[piman, 2012-09-18 00:19:41]

https://codereview.chromium.org/10916355/diff/1/content/common/gpu/texture_im...
File content/common/gpu/texture_image_transport_surface.cc (right):

https://codereview.chromium.org/10916355/diff/1/content/common/gpu/texture_im...
content/common/gpu/texture_image_transport_surface.cc:92: surface_ = new
gfx::PbufferGLSurfaceEGL(false, gfx::Size(1, 1));
This'll break because we don't have EGL on all platforms. However, I have
thought about doing something equivalent with
gfx::GLSurface::CreateOffscreenGLSurface which should work everywhere.

[no sievers, 2012-09-18 00:41:27]

https://codereview.chromium.org/10916355/diff/1/content/common/gpu/texture_im...
File content/common/gpu/texture_image_transport_surface.cc (right):

https://codereview.chromium.org/10916355/diff/1/content/common/gpu/texture_im...
content/common/gpu/texture_image_transport_surface.cc:92: surface_ = new
gfx::PbufferGLSurfaceEGL(false, gfx::Size(1, 1));
On 2012/09/18 00:19:42, piman wrote:
> This'll break because we don't have EGL on all platforms. However, I have
> thought about doing something equivalent with
> gfx::GLSurface::CreateOffscreenGLSurface which should work everywhere.

Done.

[piman, 2012-09-18 00:42:27]

lgtm

[commit-bot: I haz the power, 2012-09-18 18:08:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sievers@chromium.org/10916355/5001

[commit-bot: I haz the power, 2012-09-18 20:57:10]

Change committed as 157415