Perf bot experiment, disable GLSL integers on ANGLE ES3

Only affects Skia tools builds, not clients.

Change-Id: I9b713b74480359c7eea8a8db7b49fb49341c7ee1
Bug: skia:10644
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/315644
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

Author: bsalomon

src/gpu/gl/GrGLCaps.cpp

@@ -401,6 +401,13 @@ void GrGLCaps::init(const GrContextOptions& contextOptions,
 
         shaderCaps->fIntegerSupport = version >= GR_GL_VER(3, 0) &&
             ctxInfo.glslGeneration() >= k330_GrGLSLGeneration; // We use this value for GLSL ES 3.0.
+#if GR_TEST_UTILS
+        // TODO(bsalomon): Revert this experiment to see if this affects ANGLE ES3 D3D11
+        //  performance.
+        if (ctxInfo.driver() == kANGLE_GrGLDriver) {
+            shaderCaps->fIntegerSupport = false;
+        }
+#endif
     } else if (GR_IS_GR_WEBGL(standard)) {
         shaderCaps->fShaderDerivativeSupport = version >= GR_GL_VER(2, 0) ||
                                                ctxInfo.hasExtension("GL_OES_standard_derivatives") ||