Lower ES3 capable requirement to GL 3.3 with extensions.

ui/gl/gl_version_info.cc

Index: ui/gl/gl_version_info.cc
diff --git a/ui/gl/gl_version_info.cc b/ui/gl/gl_version_info.cc
index aae40dd1f3f82a79633dbd863655255dbd78b8bf..a9365e0c768233712088abf327056539cf0bb7a1 100644
--- a/ui/gl/gl_version_info.cc
+++ b/ui/gl/gl_version_info.cc
@@ -83,13 +83,23 @@ bool GLVersionInfo::IsES3Capable(
     return true;
   }
 
-  // Don't try supporting ES3 on ES2, or desktop before 4.0.
-  if (is_es || !IsAtLeastGL(4, 0)) {
+  // Don't try supporting ES3 on ES2, or desktop before 3.3.
+  if (is_es || !IsAtLeastGL(3, 3)) {
     return false;
   }
 
-  bool has_tex_storage = has_extension("GL_ARB_texture_storage");
-  return has_tex_storage;
+  bool has_transform_feedback =
+      (IsAtLeastGL(4, 0) || has_extension("GL_ARB_transform_feedback2"));
+  bool has_sampler_indexing =
+      (IsAtLeastGL(4, 0) || has_extension("GL_ARB_gpu_shader5"));
+  bool has_tex_storage =
+      (IsAtLeastGL(4, 2) || has_extension("GL_ARB_texture_storage"));

[piman, 2016/10/28 20:01:21]

nit: you can skip IsAtLeastGL(4, 2), since it's always false if we get here (see
l.82-83).

[Zhenyao Mo, 2016/10/28 23:22:12]

Done.

+
+  // TODO(cwallez) check for texture related extensions. See crbug.com/623577
+
+  return (has_transform_feedback &&
+          has_sampler_indexing &&
+          has_tex_storage);
 }
 
 void GLVersionInfo::ParseVersionString(const char* version_str,