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allow SkImage::asyncRescaleAndReadPixels() to work async on WebGL #169

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allow SkImage::asyncRescaleAndReadPixels() to work async on WebGL #169

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jamesruan
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Reading back pixels is blocking on WebGL. This is because skia lacks pixel transfer support with out mapping.

WebGL has PBO for async reading, however it use glGetBufferSubData() to read back from PIXEL_PACK_BUFFER instead of mapping

  • add GetBufferSubData to GrGLInterface
  • add GrGpuBuffer::getData()
  • TAsyncReadResult use getData() to copy pixels to cpu plane

@jamesruan
allow SkImage::asyncRescaleAndReadPixels() to work async on WebGL
3036904 
Reading back pixels is blocking on WebGL. This is because skia lacks pixel
transfer support with out mapping.

WebGL has PBO for async reading, however it use `glGetBufferSubData()` to read
back from PIXEL_PACK_BUFFER instead of mapping

- add GetBufferSubData to GrGLInterface
- add GrGpuBuffer::getData()
- TAsyncReadResult use getData() to copy pixels to cpu plane
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This PR (HEAD: 3036904) has been imported to Gerrit for code review.

Please visit review.skia.org/833776 to see it. Please CC yourself to the Gerrit change.

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