Move static GL binding initialization to //ui/gl/init.

ui/gl/init/gl_factory.cc

Index: ui/gl/init/gl_factory.cc
diff --git a/ui/gl/init/gl_factory.cc b/ui/gl/init/gl_factory.cc
index bab99ea3ae0b5896f3bd1915c83332c0dcb68c43..85332096c0ae09b8c716fdd6b12b9e034627af01 100644
--- a/ui/gl/init/gl_factory.cc
+++ b/ui/gl/init/gl_factory.cc
@@ -83,5 +83,12 @@ bool InitializeGLOneOffImplementation(GLImplementation impl,
   return initialized;
 }
 
+void ClearGLBindings() {
+  ClearGLBindingsPlatform();
+
+  SetGLImplementation(kGLImplementationNone);
+  UnloadGLNativeLibraries();
+}
+
 }  // namespace init
 }  // namespace gl