Alloc glyph image correctly for SkMask::k3D_Format.

Re-enable the code to test the emboss mask filter, updating it to use
the new emboss mask filter factory.

Add a test to ensure that embossed text is drawn correctly, as before
glyphs did not allocate the proper amount of memory for the k3D_Format
which the emboss mask filter produces.

Fixes SkEmbossMask::Emboss to write the whole of the mul and add planes
to avoid pixel differences and MemorySanitizer errors.

Update the GPU to understand the k3D_Format and use just the alpha
plane, ignoring the mul and add plane which it currently cannot support.

Change-Id: I90edf34a918c06b0c6b24bfc43ce7031419eca41
Reviewed-on: https://skia-review.googlesource.com/70260
Reviewed-on: https://skia-review.googlesource.com/70962
Reviewed-on: https://skia-review.googlesource.com/71282
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>

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