gpu: Clarify sized texture format is available only if ES3 context or immutable texture is supported

gpu/command_buffer/service/feature_info.h

Index: gpu/command_buffer/service/feature_info.h
diff --git a/gpu/command_buffer/service/feature_info.h b/gpu/command_buffer/service/feature_info.h
index 57ac4f449c805db7e14e215dd9a57875bb192e15..9038ca8222977b6f9b223879ea10a7a0eb264368 100644
--- a/gpu/command_buffer/service/feature_info.h
+++ b/gpu/command_buffer/service/feature_info.h
@@ -92,6 +92,8 @@ class GPU_EXPORT FeatureInfo : public base::RefCounted<FeatureInfo> {
     bool ext_read_format_bgra;
     bool desktop_srgb_support;
     bool arb_es3_compatibility;
+    bool chromium_color_buffer_float_rgb = false;
+    bool chromium_color_buffer_float_rgba = false;
   };
 
   FeatureInfo();
@@ -189,8 +191,6 @@ class GPU_EXPORT FeatureInfo : public base::RefCounted<FeatureInfo> {
 
   bool unsafe_es3_apis_enabled_;
 
-  bool chromium_color_buffer_float_rgba_available_;
-  bool chromium_color_buffer_float_rgb_available_;
   bool ext_color_buffer_float_available_;
   bool oes_texture_float_linear_available_;
   bool oes_texture_half_float_linear_available_;