If ES3 EGL config selection fails, fall back to ES2.

ui/gl/gl_context_egl.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 "ui/gl/gl_context_egl.h"
 
 #include <memory>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 22 matching lines @@
       config_(nullptr),
       unbind_fbo_on_makecurrent_(false),
       swap_interval_(1) {
 }
 
 bool GLContextEGL::Initialize(
     GLSurface* compatible_surface, GpuPreference gpu_preference) {
   DCHECK(compatible_surface);
   DCHECK(!context_);
 
+  display_ = compatible_surface->GetDisplay();
+  config_ = compatible_surface->GetConfig();
+
+  EGLint config_renderable_type = 0;
+  if (!eglGetConfigAttrib(display_, config_, EGL_RENDERABLE_TYPE,
+                          &config_renderable_type)) {
+    LOG(ERROR) << "eglGetConfigAttrib failed with error "
+               << GetLastEGLErrorString();
+    return false;
+  }
+
   EGLint context_client_version = 2;
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableUnsafeES3APIs)) {
+          switches::kEnableUnsafeES3APIs) &&
+      (config_renderable_type & EGL_OPENGL_ES3_BIT) != 0) {
     context_client_version = 3;
   }
 
   const EGLint kContextAttributes[] = {
     EGL_CONTEXT_CLIENT_VERSION, context_client_version,
     EGL_NONE
   };
   const EGLint kContextRobustnessAttributes[] = {
     EGL_CONTEXT_CLIENT_VERSION, context_client_version,
     EGL_CONTEXT_OPENGL_RESET_NOTIFICATION_STRATEGY_EXT,
     EGL_LOSE_CONTEXT_ON_RESET_EXT,
     EGL_NONE
   };
 
-  display_ = compatible_surface->GetDisplay();
-  config_ = compatible_surface->GetConfig();
-
   const EGLint* context_attributes = nullptr;
   if (GLSurfaceEGL::IsCreateContextRobustnessSupported()) {
     DVLOG(1) << "EGL_EXT_create_context_robustness supported.";
     context_attributes = kContextRobustnessAttributes;
   } else {
     // At some point we should require the presence of the robustness
     // extension and remove this code path.
     DVLOG(1) << "EGL_EXT_create_context_robustness NOT supported.";
     context_attributes = kContextAttributes;
   }
@@ skipping 142 matching lines @@
 
 bool GLContextEGL::WasAllocatedUsingRobustnessExtension() {
   return GLSurfaceEGL::IsCreateContextRobustnessSupported();
 }
 
 GLContextEGL::~GLContextEGL() {
   Destroy();
 }
 
 }  // namespace gl