fuchsia: Disable GL

I think we'll only need Vulkan. But in any case, the GL code doesn't
build, so disable it for now.

Bug: chromium:808287
Change-Id: I08f8cd09e67d91c08b7632e54bbdc6a11ee57014
Reviewed-on: https://chromium-review.googlesource.com/c/1298381
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Scott Graham <scottmg@chromium.org>

gni/angle.gni

@@ -2,9 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build_overrides/build.gni")
-import("//build/config/ui.gni")  # import the use_x11 variable
 import("//build/config/sanitizers/sanitizers.gni")
+import("//build/config/ui.gni")  # import the use_x11 variable
+import("//build_overrides/build.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
 }
@@ -57,7 +57,8 @@ declare_args() {
 declare_args() {
   angle_enable_d3d9 = is_win
   angle_enable_d3d11 = is_win
-  angle_enable_gl = ozone_platform_gbm || !is_linux || (use_x11 && !is_chromeos)
+  angle_enable_gl = (ozone_platform_gbm || !is_linux ||
+                     (use_x11 && !is_chromeos)) && !is_fuchsia
 
   angle_enable_vulkan = is_win || (is_linux && use_x11 && !is_chromeos) ||
                         (is_android && ndk_supports_vulkan)