Add support for IMG's MSAA extension.
Review URL: https://codereview.chromium.org/12875005

git-svn-id: http://skia.googlecode.com/svn/trunk@8241 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/gpu/gl/GrGLFunctions.h b/include/gpu/gl/GrGLFunctions.h
index d80b1f6..037ebfd 100644
--- a/include/gpu/gl/GrGLFunctions.h
+++ b/include/gpu/gl/GrGLFunctions.h
@@ -89,6 +89,7 @@
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLFlushProc)();
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLFramebufferRenderbufferProc)(GrGLenum target, GrGLenum attachment, GrGLenum renderbuffertarget, GrGLuint renderbuffer);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLFramebufferTexture2DProc)(GrGLenum target, GrGLenum attachment, GrGLenum textarget, GrGLuint texture, GrGLint level);
+    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLFramebufferTexture2DMultisampleProc)(GrGLenum target, GrGLenum attachment, GrGLenum textarget, GrGLuint texture, GrGLint level, GrGLsizei samples);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLFrontFaceProc)(GrGLenum mode);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGenBuffersProc)(GrGLsizei n, GrGLuint* buffers);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGenFramebuffersProc)(GrGLsizei n, GrGLuint *framebuffers);