Revert of Enable creation of offscreen contexts which own their backing surface.

ui/gl/gl_surface_egl.cc

Index: ui/gl/gl_surface_egl.cc
diff --git a/ui/gl/gl_surface_egl.cc b/ui/gl/gl_surface_egl.cc
index 3e4243b2dac22e9e63a56f149eac214e403eb16a..1d5c1409980618730e2f732cfd15b916bfeab6c6 100644
--- a/ui/gl/gl_surface_egl.cc
+++ b/ui/gl/gl_surface_egl.cc
@@ -134,7 +134,6 @@
 bool g_egl_window_fixed_size_supported = false;
 bool g_egl_surfaceless_context_supported = false;
 bool g_egl_surface_orientation_supported = false;
-bool g_egl_context_priority_supported = false;
 bool g_use_direct_composition = false;
 
 base::LazyInstance<ANGLEPlatformImpl> g_angle_platform_impl =
@@ -243,7 +242,6 @@
 EGLConfig ChooseConfig(GLSurfaceFormat format) {
   // Choose an EGL configuration.
   // On X this is only used for PBuffer surfaces.
-
   std::vector<EGLint> renderable_types;
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableES3GLContext)) {
@@ -254,9 +252,6 @@
   EGLint buffer_size = format.GetBufferSize();
   EGLint alpha_size = 8;
   bool want_rgb565 = buffer_size == 16;
-  EGLint depth_size = format.GetDepthBits();
-  EGLint stencil_size = format.GetStencilBits();
-  EGLint samples = format.GetSamples();
 
 #if defined(USE_X11) && !defined(OS_CHROMEOS)
   // If we're using ANGLE_NULL, we may not have a display, in which case we
@@ -283,12 +278,6 @@
                                     8,
                                     EGL_RED_SIZE,
                                     8,
-                                    EGL_SAMPLES,
-                                    samples,
-                                    EGL_DEPTH_SIZE,
-                                    depth_size,
-                                    EGL_STENCIL_SIZE,
-                                    stencil_size,
                                     EGL_RENDERABLE_TYPE,
                                     renderable_type,
                                     EGL_SURFACE_TYPE,
@@ -303,12 +292,6 @@
                                    6,
                                    EGL_RED_SIZE,
                                    5,
-                                   EGL_SAMPLES,
-                                   samples,
-                                   EGL_DEPTH_SIZE,
-                                   depth_size,
-                                   EGL_STENCIL_SIZE,
-                                   stencil_size,
                                    EGL_RENDERABLE_TYPE,
                                    renderable_type,
                                    EGL_SURFACE_TYPE,
@@ -522,21 +505,6 @@
       HasEGLExtension("EGL_ANGLE_window_fixed_size");
   g_egl_surface_orientation_supported =
       HasEGLExtension("EGL_ANGLE_surface_orientation");
-  // According to
-  // https://source.android.com/compatibility/android-cdd.html the
-  // EGL_IMG_context_priority extension is mandatory for Virtual
-  // Reality High Performance support, but it's not showing in the
-  // list of reported EGL extensions even though it's supported on
-  // Daydream ready devices. As a fallback, check if other related
-  // extensions that were added for VR support are present, and assume
-  // that this implies context priority is also supported.
-  // TODO(klausw): is there a better way to do this? Filed
-  // https://github.com/googlevr/gvr-android-sdk/issues/330 for
-  // followup.
-  g_egl_context_priority_supported =
-      HasEGLExtension("EGL_IMG_context_priority") || (
-          HasEGLExtension("EGL_ANDROID_front_buffer_auto_refresh") &&
-          HasEGLExtension("EGL_ANDROID_create_native_client_buffer"));
 
   // Need EGL_ANGLE_flexible_surface_compatibility to allow surfaces with and
   // without alpha to be bound to the same context.
@@ -596,7 +564,6 @@
   g_egl_sync_control_supported = false;
   g_egl_window_fixed_size_supported = false;
   g_egl_surface_orientation_supported = false;
-  g_egl_context_priority_supported = false;
   g_use_direct_composition = false;
   g_egl_surfaceless_context_supported = false;
 
@@ -639,11 +606,6 @@
 // static
 bool GLSurfaceEGL::IsEGLSurfacelessContextSupported() {
   return g_egl_surfaceless_context_supported;
-}
-
-// static
-bool GLSurfaceEGL::IsEGLContextPrioritySupported() {
-  return g_egl_context_priority_supported;
 }
 
 // static