Remove dependence on platform GL to build Gr, add optional platform-specific default impls

This enables us to build skia in Chrome without a dependency on the gles2 lib.

[reed1, 2011-04-04 15:32:39]

LGTM

[twiz1, 2011-04-04 16:59:31]

LGTM

http://codereview.appspot.com/4354048/diff/2001/gpu/include/GrGLInterface.h
File gpu/include/GrGLInterface.h (right):

http://codereview.appspot.com/4354048/diff/2001/gpu/include/GrGLInterface.h#n...
gpu/include/GrGLInterface.h:303: // make this the last entry in the statc
initializer. It can help to guard
static

http://codereview.appspot.com/4354048/diff/2001/gpu/src/GrGLInterface.cpp
File gpu/src/GrGLInterface.cpp (right):

http://codereview.appspot.com/4354048/diff/2001/gpu/src/GrGLInterface.cpp#new...
gpu/src/GrGLInterface.cpp:86:
GrGLGetGLInterface()->fGetString(GR_GL_EXTENSIONS));
Good catch.

[bsalomon, 2011-04-04 17:29:06]

thanks for the reviews! Checked in as r1045, closed. 

On 2011/04/04 16:59:31, twiz1 wrote:
> LGTM
> 
> http://codereview.appspot.com/4354048/diff/2001/gpu/include/GrGLInterface.h
> File gpu/include/GrGLInterface.h (right):
> 
>
http://codereview.appspot.com/4354048/diff/2001/gpu/include/GrGLInterface.h#n...
> gpu/include/GrGLInterface.h:303: // make this the last entry in the statc
> initializer. It can help to guard
> static
> 
> http://codereview.appspot.com/4354048/diff/2001/gpu/src/GrGLInterface.cpp
> File gpu/src/GrGLInterface.cpp (right):
> 
>
http://codereview.appspot.com/4354048/diff/2001/gpu/src/GrGLInterface.cpp#new...
> gpu/src/GrGLInterface.cpp:86:
> GrGLGetGLInterface()->fGetString(GR_GL_EXTENSIONS));
> Good catch.