Support GL_EXT_texture_sRGB_R(G)8 extensions in fbo completeness tests.

Change-Id: Ic91c8106f63848c0f960af45b75a55f62a2d107e
diff --git a/modules/glshared/glsFboCompletenessTests.cpp b/modules/glshared/glsFboCompletenessTests.cpp
index 6033acf..fc93f49 100644
--- a/modules/glshared/glsFboCompletenessTests.cpp
+++ b/modules/glshared/glsFboCompletenessTests.cpp
@@ -207,6 +207,16 @@
 	GLS_UNSIZED_FORMATKEY(GL_RGBA,		GL_UNSIGNED_BYTE),
 };
 
+static const FormatKey s_extTextureSRGBR8Formats[] =
+{
+	GL_SR8_EXT,
+};
+
+static const FormatKey s_extTextureSRGBRG8Formats[] =
+{
+	GL_SRG8_EXT,
+};
+
 static const FormatExtEntry s_esExtFormats[] =
 {
 	{
@@ -378,6 +388,17 @@
 		TEXTURE_VALID, // explicitly unrenderable
 		GLS_ARRAY_RANGE(s_oesRequiredInternalFormat10bitColorFormats)
 	},
+
+	{
+		"GL_EXT_texture_sRGB_R8",
+		TEXTURE_VALID,
+		GLS_ARRAY_RANGE(s_extTextureSRGBR8Formats)
+	},
+	{
+		"GL_EXT_texture_sRGB_RG8",
+		TEXTURE_VALID,
+		GLS_ARRAY_RANGE(s_extTextureSRGBRG8Formats)
+	},
 };
 
 Context::Context (TestContext& testCtx,