This is a combination of:

- Changing the "scripts/generate_entry_points.py" script to tell it to
  also auto-generate GLES 3.2.  Also changing "scripts/gen_proc_table.py".

- Generating new and modified files needed to add GLES 3.2 to the
  ANGLE front-end.  This is done by running the following command:
  "python scripts/run_code_generation.py".

- Creating the following files:

  - src/libANGLE/validationES32.h
  - src/libANGLE/validationES32.cpp
  - src/libANGLE/capture_gles_3_2_params.cpp

- Hand-editing the following files:

  - src/libGLESv1_CM/libGLESv1_CM.cpp
  - include/GLES2/gl2ext_angle.h
  - src/libGLESv2.gni
  - src/libANGLE/Context.h
  - src/libANGLE/Context.cpp
  - src/libANGLE/Context_gl.cpp
  - src/libANGLE/ErrorStrings.h
  - src/libANGLE/State.h
  - src/libANGLE/validationES1.cpp
  - src/libANGLE/validationGL3.cpp
  - src/libANGLE/validationGL31.cpp
  - src/libANGLE/validationGL32.cpp
  - src/libANGLE/validationGL33.cpp
  - src/libANGLE/validationGL4.cpp
  - src/libANGLE/validationGL43.cpp
  - src/libANGLE/validationGL45.cpp

Bug: angleproject:3649
Change-Id: I5b67f72e3e3b55e74039ec3e28aa8d399ec08cf2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1850231Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Ian Elliott <ianelliott@google.com>