Update from https://crrev.com/320343

gpu/gles2_conform_support/gles2_conform_support.gyp

Index: gpu/gles2_conform_support/gles2_conform_support.gyp
diff --git a/gpu/gles2_conform_support/gles2_conform_support.gyp b/gpu/gles2_conform_support/gles2_conform_support.gyp
index 6bf8510e5549ab283268638055586887e294f18b..05aa9ac3351988ec89668fd650ce6e241f9b7aa1 100644
--- a/gpu/gles2_conform_support/gles2_conform_support.gyp
+++ b/gpu/gles2_conform_support/gles2_conform_support.gyp
@@ -30,6 +30,7 @@
   },
   'targets': [
     {
+      # GN version: //gpu/gles2_conform_support/egl
       'target_name': 'egl_native',
       'type': 'static_library',
       'dependencies': [
@@ -60,6 +61,7 @@
       'msvs_disabled_warnings': [ 4267, ],
     },
     {
+      # GN version: //gpu/gles2_conform_support/native
       'target_name': 'egl_main_native',
       'type': 'static_library',
       'dependencies': [
@@ -77,6 +79,7 @@
       ],
     },
     {
+      # GN version: //gpu/gles2_conform_support/native:windowless
       'target_name': 'egl_main_windowless',
       'type': 'static_library',
       'dependencies': [