Abstract OSMesa from the Layout tests

ui/gl/init/gl_factory.h

Index: ui/gl/init/gl_factory.h
diff --git a/ui/gl/init/gl_factory.h b/ui/gl/init/gl_factory.h
index 4e62d2106a6419c2c666144ba9079f1f31deee21..c3908fa5b8b8d936c21212b7275ccfd0e4ab84af 100644
--- a/ui/gl/init/gl_factory.h
+++ b/ui/gl/init/gl_factory.h
@@ -33,10 +33,11 @@ GL_INIT_EXPORT bool InitializeGLOneOff();
 
 // Initializes GL bindings using the provided parameters. This might be required
 // for use in tests, otherwise use InitializeGLOneOff() instead.
-GL_INIT_EXPORT bool InitializeGLOneOffImplementation(GLImplementation impl,
-                                                     bool fallback_to_osmesa,
-                                                     bool gpu_service_logging,
-                                                     bool disable_gl_drawing);
+GL_INIT_EXPORT bool InitializeGLOneOffImplementation(
+    GLImplementation impl,
+    bool fallback_to_software_gl,
+    bool gpu_service_logging,
+    bool disable_gl_drawing);
 
 // Clears GL bindings and resets GL implementation.
 GL_INIT_EXPORT void ShutdownGL();