Add control of manual mipmapping to GrContextOptions

include/gpu/GrContextOptions.h

Index: include/gpu/GrContextOptions.h
diff --git a/include/gpu/GrContextOptions.h b/include/gpu/GrContextOptions.h
index 7b62c94a44ce0ba1f1650de81e73dcf03779d3d4..37d47ef6b2da19dab84abe8974dadbf0b7f8267b 100644
--- a/include/gpu/GrContextOptions.h
+++ b/include/gpu/GrContextOptions.h
@@ -67,6 +67,10 @@ struct GrContextOptions {
     /** Force us to do all swizzling manually in the shader and don't rely on extensions to do
         swizzling. */
     bool fUseShaderSwizzling;
+
+    /** Construct mipmaps manually, via repeated downsampling draw-calls. This is used when
+        the driver's implementation (glGenerateMipmap) contains bugs. */

[bsalomon, 2016/06/09 16:13:11]

Comment that this requires mip map level/lod control?

+    bool fDoManualMipmapping;
 };
 
 #endif