A cherry picked patch brought version 9 files, which 6.5 cannot load.

Fixes: QTBUG-135407
Change-Id: Ibd1dd0e44b0f0d32ae1d4a82582a2414debfb11a
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

Using textureSize in the uniform block leads to renaming it
to _textureSize when transpiling to GLSL. This is not
reflected in the reflection metadata for some reason.
For OpenGL this matters because the QRhi backend won't
be correctly able to set up the uniforms when the
names do not match. To overcome this, use a name
in the shader that does not conflict with a built-in
GLSL function. Strictly speaking the name (textureSize)
is somewhat incorrect anyway. Use texCoordScale to
express its meaning better.

Pick-to: 6.2
Change-Id: I863e98c6d56cc46fad895763b9b5106a40e2952c
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
(cherry picked from commit 3d8c86976844bc9507b0ff677188eee64e49b732)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 19461382758c177376ccde23dcce8ba5b2b8bfe5)

Change-Id: Id4fe4d0e177180fadd10f34b9ebad17c71e40314
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

And port the graph example to QSGMaterial and the RHI. We will not anymore add a
direct OpenGL path (that would mean using QSGMaterialShader) for the example because
the upcoming purge renders that useless anyway.

Task-number: QTBUG-82988
Change-Id: I137575ed5df45b6bfc34a11d73dc5100945081c5
Reviewed-by: Andy Nichols <andy.nichols@qt.io>