Refactor GL bindings so there is no global GLApi or DriverGL.

ui/gl/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
@@ skipping 37 matching lines @@
     "android/scoped_java_surface.cc",
     "android/scoped_java_surface.h",
     "android/surface_texture.cc",
     "android/surface_texture.h",
     "android/surface_texture_listener.cc",
     "android/surface_texture_listener.h",
     "ca_renderer_layer_params.cc",
     "ca_renderer_layer_params.h",
     "gl_bindings.cc",
     "gl_bindings.h",
-    "gl_bindings_autogen_gl.cc",
     "gl_bindings_autogen_gl.h",
+    "gl_bindings_autogen_gl0.cc",
+    "gl_bindings_autogen_gl1.cc",
+    "gl_bindings_autogen_gl2.cc",
+    "gl_bindings_autogen_gl3.cc",
+    "gl_bindings_autogen_gl4.cc",
     "gl_bindings_autogen_osmesa.cc",
     "gl_bindings_autogen_osmesa.h",
     "gl_context.cc",
     "gl_context.h",
     "gl_context_osmesa.cc",
     "gl_context_osmesa.h",
     "gl_context_stub.cc",
     "gl_context_stub.h",
-    "gl_context_stub_with_extensions.cc",
-    "gl_context_stub_with_extensions.h",
     "gl_enums.cc",
     "gl_enums.h",
     "gl_enums_implementation_autogen.h",
     "gl_export.h",
     "gl_fence.cc",
     "gl_fence.h",
     "gl_fence_arb.cc",
     "gl_fence_arb.h",
     "gl_fence_nv.cc",
     "gl_fence_nv.h",
@@ skipping 35 matching lines @@
     "gl_surface_stub.cc",
     "gl_surface_stub.h",
     "gl_switches.cc",
     "gl_switches.h",
     "gl_version_info.cc",
     "gl_version_info.h",
     "gpu_switching_manager.cc",
     "gpu_switching_manager.h",
     "gpu_timing.cc",
     "gpu_timing.h",
-    "scoped_api.cc",
-    "scoped_api.h",
     "scoped_binders.cc",
     "scoped_binders.h",
     "scoped_make_current.cc",
     "scoped_make_current.h",
     "sync_control_vsync_provider.cc",
     "sync_control_vsync_provider.h",
     "trace_util.cc",
     "trace_util.h",
   ]
 
@@ skipping 304 matching lines @@
     sources = [
       "../android/java/src/org/chromium/ui/gl/SurfaceTextureListener.java",
       "../android/java/src/org/chromium/ui/gl/SurfaceTexturePlatformWrapper.java",
     ]
     public_deps = [
       ":surface_jni_headers",
     ]
     jni_package = "ui/gl"
   }
 }