More reliable check for whether EGLSyncControlVSyncProvider should be instantiated.

ui/gl/gl_surface_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_surface_egl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 128 matching lines @@
 
 class EGLSyncControlVSyncProvider : public SyncControlVSyncProvider {
  public:
   explicit EGLSyncControlVSyncProvider(EGLSurface surface)
       : SyncControlVSyncProvider(),
         surface_(surface) {
   }
 
   ~EGLSyncControlVSyncProvider() override {}
 
+  static bool IsSupported() {
+    return SyncControlVSyncProvider::IsSupported() &&
+           g_egl_sync_control_supported;
+  }
+
  protected:
   bool GetSyncValues(int64_t* system_time,
                      int64_t* media_stream_counter,
                      int64_t* swap_buffer_counter) override {
     uint64_t u_system_time, u_media_stream_counter, u_swap_buffer_counter;
     bool result = eglGetSyncValuesCHROMIUM(
         g_display, surface_, &u_system_time,
         &u_media_stream_counter, &u_swap_buffer_counter) == EGL_TRUE;
     if (result) {
       *system_time = static_cast<int64_t>(u_system_time);
@@ skipping 642 matching lines @@
     EGLBoolean retVal = eglQuerySurface(
         GetDisplay(), surface_, EGL_POST_SUB_BUFFER_SUPPORTED_NV, &surfaceVal);
     supports_post_sub_buffer_ = (surfaceVal && retVal) == EGL_TRUE;
   }
 
   supports_swap_buffer_with_damage_ =
       g_driver_egl.ext.b_EGL_KHR_swap_buffers_with_damage;
 
   if (sync_provider)
     vsync_provider_ = std::move(sync_provider);
-  else if (g_egl_sync_control_supported)
+  else if (EGLSyncControlVSyncProvider::IsSupported())
     vsync_provider_.reset(new EGLSyncControlVSyncProvider(surface_));
   return true;
 }
 
 bool NativeViewGLSurfaceEGL::InitializeNativeWindow() {
   return true;
 }
 
 void NativeViewGLSurfaceEGL::Destroy() {
   if (surface_) {
@@ skipping 423 matching lines @@
 }
 
 void* SurfacelessEGL::GetShareHandle() {
   return NULL;
 }
 
 SurfacelessEGL::~SurfacelessEGL() {
 }
 
 }  // namespace gl