Add predefined gles4444 config

Change-Id: I166bd3d99090dde58f71043e830a1ee132dac044
Reviewed-on: https://skia-review.googlesource.com/99442
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/tools/flags/SkCommonFlagsConfig.cpp b/tools/flags/SkCommonFlagsConfig.cpp
index 6380b03..91805a9 100644
--- a/tools/flags/SkCommonFlagsConfig.cpp
+++ b/tools/flags/SkCommonFlagsConfig.cpp
@@ -59,6 +59,7 @@
     { "glwide",                "gpu", "api=gl,color=f16_wide" },
     { "glnarrow",              "gpu", "api=gl,color=f16_narrow" },
     { "glnostencils",          "gpu", "api=gl,stencils=false" },
+    { "gles4444",              "gpu", "api=gles,color=4444" },
     { "glessrgb",              "gpu", "api=gles,color=srgb" },
     { "gleswide",              "gpu", "api=gles,color=f16_wide" },
     { "glesnarrow",            "gpu", "api=gles,color=f16_narrow" },