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

ui/gl/gl_context_egl.cc

Index: ui/gl/gl_context_egl.cc
diff --git a/ui/gl/gl_context_egl.cc b/ui/gl/gl_context_egl.cc
index fad588bbfe3b1330afba0d0a278b1deebca6668f..6af5611d08ffee62bc4e5fe8e1bd08567e12b877 100644
--- a/ui/gl/gl_context_egl.cc
+++ b/ui/gl/gl_context_egl.cc
@@ -40,9 +40,21 @@ bool GLContextEGL::Initialize(
   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;
   }
 
@@ -57,9 +69,6 @@ bool GLContextEGL::Initialize(
     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.";