Fixed dangling pointers in Surface

Fixed dangling pointers in Surface.

When the surface is reset, either because of device lost or a window resize, and any of these fail:

CreateDepthStencilSurface
CreateTexture

Some subsset of mSwapChain and/or mDepthStencil would be left uninitialized. This seemed to happen frequently on WIndows XP boxes.

Example crash dumps:

Thread 0 *CRASHED* ( EXCEPTION_ACCESS_VIOLATION_READ @ 0xffffffff800f0004 )

0x014f1aac	 [libegl.dll	 - surface.cpp:479]	egl::Surface::getDepthStencil()
0x1001324c	 [libglesv2.dll	 - context.cpp:301]	gl::Context::makeCurrent(egl::Display *,egl::Surface *)
0x10018c7e	 [libglesv2.dll	 - main.cpp:85]	gl::makeCurrent(gl::Context *,egl::Display *,egl::Surface *)
0x10017366	 [libglesv2.dll	 - context.cpp:3524]	glMakeCurrent
0x014f607c	 [libegl.dll	 - libegl.cpp:884]	eglMakeCurrent

Thread 0 *CRASHED* ( EXCEPTION_ACCESS_VIOLATION_READ @ 0xffffffffe95b5a5d )

0x01131a14	 [libegl.dll	 - surface.cpp:433]	egl::Surface::swap()
0x01136310	 [libegl.dll	 - libegl.cpp:1043]	eglSwapBuffers
0x0214ac64	 [chrome.dll	 - gl_context_egl.cc:240]	gfx::NativeViewEGLContext::SwapBuffers()

[apatrick1, 2011-01-13 00:04:36]

Daniel,

I think I found a bug.

Thanks,

Al

[dgkoch, 2011-01-13 04:26:07]

LGTM