Extended debug GL interface to include textures

Extended debug GL interface to include textures. 

This delivery also includes some cleanup of the debug interface's framework (e.g., added a factory to unify object creation, merged the find methods to reduce redundancy, added a shared base class between render buffer and texture objects)

Made minor change to GrGpuGL.cpp to unbind a texture from the current texture unit before attaching it to the frame buffer.

[bsalomon, 2012-03-26 14:06:44]

LGTM

http://codereview.appspot.com/5903043/diff/1/src/gpu/gl/GrGLCreateDebugInterf...
File src/gpu/gl/GrGLCreateDebugInterface.cpp (right):

http://codereview.appspot.com/5903043/diff/1/src/gpu/gl/GrGLCreateDebugInterf...
src/gpu/gl/GrGLCreateDebugInterface.cpp:33: public:                             
                   \
If your defining macros only used within this cpp its ok (but not required) to
drop the GR_ prefix.

minor nit: it might be nice to line up the \s

http://codereview.appspot.com/5903043/diff/1/src/gpu/gl/GrGLCreateDebugInterf...
src/gpu/gl/GrGLCreateDebugInterface.cpp:1577: // TODO: there are some issues w/
wrapping another GL interface inside the
Can we wrap the comments to 80 col? Our rule is most lines should wrap to 80 col
unless it's quite ugly to do so (judgement call)

[robertphillips, 2012-03-26 17:59:41]

committed as r3495

http://codereview.appspot.com/5903043/diff/1/src/gpu/gl/GrGLCreateDebugInterf...
File src/gpu/gl/GrGLCreateDebugInterface.cpp (right):

http://codereview.appspot.com/5903043/diff/1/src/gpu/gl/GrGLCreateDebugInterf...
src/gpu/gl/GrGLCreateDebugInterface.cpp:33: public:                             
                   \
On 2012/03/26 14:06:44, bsalomon wrote:
> If your defining macros only used within this cpp its ok (but not required) to
> drop the GR_ prefix.
> 
> minor nit: it might be nice to line up the \s

Done.