Beginning of support for texture rectangles.

include/gpu/gl/SkGLContext.h

Index: include/gpu/gl/SkGLContext.h
diff --git a/include/gpu/gl/SkGLContext.h b/include/gpu/gl/SkGLContext.h
index 7edfa730aa746ac33e3366e327645df9f38aeea7..77fd325dd853e9eac8d061316134474258135071 100644
--- a/include/gpu/gl/SkGLContext.h
+++ b/include/gpu/gl/SkGLContext.h
@@ -41,6 +41,11 @@ public:
     virtual GrEGLImage texture2DToEGLImage(GrGLuint /*texID*/) const { return 0; }
     virtual void destroyEGLImage(GrEGLImage) const {}
 
+    /** Used for testing GL_TEXTURE_RECTANGLE integration. */
+    GrGLint createTextureRectangle(int width, int height, GrGLenum internalFormat,
+                                   GrGLenum externalFormat, GrGLenum externalType,
+                                   GrGLvoid* data);
+
     /**
      * Used for testing EGLImage integration. Takes a EGLImage and wraps it in a
      * GL_TEXTURE_EXTERNAL_OES.