Allow ReadPixels with GL_FLOAT type and EXT_color_buffer_half_float.

BUG=angleproject:2148

Change-Id: If3fa4a42a7343ed133f85be1a4d9d0fa48b427cd
Reviewed-on: https://chromium-review.googlesource.com/665158
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
diff --git a/src/tests/gl_tests/WebGLCompatibilityTest.cpp b/src/tests/gl_tests/WebGLCompatibilityTest.cpp
index a46bac8..85d1861 100644
--- a/src/tests/gl_tests/WebGLCompatibilityTest.cpp
+++ b/src/tests/gl_tests/WebGLCompatibilityTest.cpp
@@ -37,11 +37,11 @@
 constexpr const char *FloatingPointTextureExtensions[] = {
     "",
     "GL_EXT_texture_storage",
-    "GL_OES_texture_float",
-    "GL_OES_texture_float_linear",
     "GL_OES_texture_half_float",
     "GL_OES_texture_half_float_linear",
     "GL_EXT_color_buffer_half_float",
+    "GL_OES_texture_float",
+    "GL_OES_texture_float_linear",
     "GL_EXT_color_buffer_float",
     "GL_CHROMIUM_color_buffer_float_rgba",
     "GL_CHROMIUM_color_buffer_float_rgb",