gpu: check GL_RGB565 work in ES3 context

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/feature_info.h"
 
 #include <stddef.h>
 
 #include <set>
 #include <vector>
@@ skipping 1389 matching lines @@
 
   if (gl_version_info_->IsLowerThanGL(4, 3)) {
     // crbug.com/481184.
     // GL_PRIMITIVE_RESTART_FIXED_INDEX is only available on Desktop GL 4.3+,
     // but we emulate ES 3.0 on top of Desktop GL 4.2+.
     feature_flags_.emulate_primitive_restart_fixed_index = true;
   }
 }
 
 bool FeatureInfo::IsES3Capable() const {
+  if (testing_es3_apis_enabled_)
+    return true;
   if (!enable_unsafe_es3_apis_switch_)
     return false;
   if (workarounds_.disable_texture_storage)
     return false;
   if (gl_version_info_)
     return gl_version_info_->is_es3_capable;
   return false;
 }
 
+void FeatureInfo::EnableES3ValidatorsForTesting() {
+  testing_es3_apis_enabled_ = true;
+  EnableES3Validators();
+}
+
 void FeatureInfo::EnableES3Validators() {
   DCHECK(IsES3Capable());
   validators_.UpdateValuesES3();
 
   GLint max_color_attachments = 0;
   glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &max_color_attachments);
   const int kTotalColorAttachmentEnums = 16;
   const GLenum kColorAttachments[] = {
     GL_COLOR_ATTACHMENT0,
     GL_COLOR_ATTACHMENT1,
@@ skipping 119 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu