This CL contains two changes. One to how we print out GLboolean
values, and another to how we capture GLbooleans.

According to the spec, anything non-zero can be considered
GL_TRUE when setting state:

    When the type of internal state is boolean, zero integer or
    floating-point values are converted to FALSE and non-zero values
    are converted to TRUE.

Dota Underlords is using 0xFF for GL_TRUE.

Before the change, this manifested as:

    // logcat
    glColorMask(context = 4, red   = kUnknownGLenumString,
                             green = kUnknownGLenumString,
                             blue  = kUnknownGLenumString,
                             alpha = GL_FALSE)

    // trace
    glColorMask(GL_INVALID_ENUM, GL_INVALID_ENUM, GL_INVALID_ENUM, GL_FALSE);

After:

    // logcat
    glColorMask(context = 4, red   = 0x00FF,
                             green = 0x00FF,
                             blue  = 0x00FF,
                             alpha = GL_FALSE)

    // trace
    glColorMask(0xFF, 0xFF, 0xFF, GL_FALSE);

Test: MEC for Dota Underlords
Bug: b/185192780
Bug: angleproject:5857
Change-Id: Ie53aeba8d8a40f91ee375467b325d8e6be053a98
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2821947
Commit-Queue: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Tim Van Patten <timvp@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>