Relimit Skia to ES2 to address performance regression

gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc

Index: gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
diff --git a/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc b/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
index 1b31ba71df1ae4d21f85792d6eea9300e2790d1c..2f2362c490aaac2e345c2ce4f01e002e930e4d6c 100644
--- a/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
+++ b/gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc
@@ -25,7 +25,14 @@ sk_sp<GrGLInterface> CreateGLES2InterfaceBindings(GLES2Interface* impl) {
   sk_sp<GrGLInterface> interface(new GrGLInterface);
   interface->fStandard = kGLES_GrGLStandard;
 
-  auto get_string = gles_bind(&GLES2Interface::GetString, impl);
+  // Allowing Skia to use GL ES 3.0 caused a perf test regression (see Issue
+  // 719572). Until that can be understood we are limiting to ES 2.0 (with
+  // extensions).
+  auto get_string = [impl](GLenum name) {
+    if (name == GL_VERSION)
+      return reinterpret_cast<const GLubyte*>("OpenGL ES 2.0 Chromium");
+    return impl->GetString(name);
+  };
   auto get_stringi = gles_bind(&GLES2Interface::GetStringi, impl);
   auto get_integerv = gles_bind(&GLES2Interface::GetIntegerv, impl);
   interface->fExtensions.init(kGLES_GrGLStandard, get_string, get_stringi,