Varya: Add testing styles for testing and improving the `colors.php` plugin.

varia/inc/wpcom-colors.php

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+<?php
+/* Custom Colors: Varia */
+
+// Background Color (White)
+// $config-global--color-background-default
+add_color_rule( 'bg', '#ffffff', array(
+
+	// Background-color
+	array( 'body', 'background-color' ),
+
+), __( 'Background Color' ) );
+
+// Text Color (Gray)
+// $config-global--color-foreground-default
+add_color_rule( 'txt', '#444444', array(
+
+	// Text-color
+	// Needs contrast against `bg` with more contrast
+	array( 'body', 'color', 'bg', 7 ),
+
+), __( 'Forground Color' ) );

varia/inc/wpcom-editor-colors.php

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+<?php
+/* Custom Editor Colors: Varia */
+
+// Background Color (White)
+// $config-global--color-background-default
+add_color_rule( 'bg', '#ffffff', array(
+
+	// Background-color
+	array( '.editor-styles-wrapper', 'background-color' ),
+
+), __( 'Background Color' ) );
+
+// Text Color (Gray)
+// $config-global--color-foreground-default
+add_color_rule( 'txt', '#444444', array(
+
+	// Text-color
+	// Needs contrast against `bg` with more contrast
+	array( '.editor-styles-wrapper', 'color', 'bg', 7 ),
+
+), __( 'Forground Color' ) );