[webgl] Refactor texture return type to return the actual texShape with the WebGLTexture

[lina128]

The texShape in texData may not be the actual texShape when the texture is created. This PR add a wrapper to the WebGLTexture type with our own defined Texture type, which contains WebGLTexture and a texShape, this texShape will be the actual texShape used when creating this texture. This PR prepares for a future change where we can return a texture to user to use directly, in which case user needs to know the actual texShape to be able to use it properly.

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This change is 

[pyu10055]

Reviewable status: 0 of 1 approvals obtained (waiting on @lina128)

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tfjs-backend-webgl/src/gpgpu_context_test.ts, line 57 at r1 (raw file):

      it('sets the output texture property to the output texture', () => {
        texture = gpgpu.createFloat32MatrixTexture(1, 1).texture;

should we add the texShape validation to these tests? or add new tests that ensure the texShape is correctly set by the creation methods.

[lina128]

Reviewable status: 0 of 1 approvals obtained (waiting on @pyu10055)

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tfjs-backend-webgl/src/gpgpu_context_test.ts, line 57 at r1 (raw file):

Previously, pyu10055 (Ping Yu) wrote…

should we add the texShape validation to these tests? or add new tests that ensure the texShape is correctly set by the creation methods.

Done.

Code quote:

sets the output texture property to the output texture

[pyu10055]

Reviewed 3 of 7 files at r1, 5 of 5 files at r2, all commit messages.
Reviewable status: complete! 1 of 1 approvals obtained