Relimit Skia to ES2 to address performance regression

gpu/skia_bindings/gl_bindings_skia_cmd_buffer.cc

 // Copyright 2013 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/skia_bindings/gl_bindings_skia_cmd_buffer.h"
 
 #include "gpu/command_buffer/client/gles2_interface.h"
 #include "third_party/skia/include/gpu/gl/GrGLInterface.h"
 
 using gpu::gles2::GLES2Interface;
 
 namespace {
 template <typename R, typename... Args>
 std::function<R(Args...)> gles_bind(R (GLES2Interface::*func)(Args...),
                                     GLES2Interface* gles2Interface) {
   return [func, gles2Interface](Args... args) {
     return (gles2Interface->*func)(args...);
   };
 }
 }  // namespace
 
 namespace skia_bindings {
 
 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,
                               get_integerv);
 
   GrGLInterface::Functions* functions = &interface->fFunctions;
   functions->fActiveTexture = gles_bind(&GLES2Interface::ActiveTexture, impl);
   functions->fAttachShader = gles_bind(&GLES2Interface::AttachShader, impl);
   functions->fBindAttribLocation =
       gles_bind(&GLES2Interface::BindAttribLocation, impl);
@@ skipping 242 matching lines @@
   functions->fProgramPathFragmentInputGen =
       gles_bind(&GLES2Interface::ProgramPathFragmentInputGenCHROMIUM, impl);
   functions->fBindFragmentInputLocation =
       gles_bind(&GLES2Interface::BindFragmentInputLocationCHROMIUM, impl);
   functions->fCoverageModulation =
       gles_bind(&GLES2Interface::CoverageModulationCHROMIUM, impl);
   return interface;
 }
 
 }  // namespace skia_bindings