Check skip test in GLCopyTexture BigTexture test

This commit adds a call to ShouldSkipTest() to the early return in
the new GLCopyTextureCHROMIUMES3Test.BigTexture tests.

Bug: 991668
Change-Id: I898a3559cf6285055336d8ef6f77d8f3be25e5e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868835Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707432}

gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc

@@ -709,7 +709,7 @@ TEST_P(GLCopyTextureCHROMIUMTest, Basic) {
 }
 
 TEST_P(GLCopyTextureCHROMIUMES3Test, BigTexture) {
-  if (ShouldSkipBGRA())
+  if (ShouldSkipTest() || ShouldSkipBGRA())
     return;
   width_ = 1080;
   height_ = 1080;