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

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index f2097c9b7f1147126e862f773772ba1555a6f48d..6781483049a2fcfa50576a4cfd6324be4b2ac353 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -500,11 +500,13 @@ class GPU_EXPORT Texture final : public TextureBase {
                                  GLenum type);
 
   static bool ColorRenderable(const FeatureInfo* feature_info,
-                              GLenum internal_format);
+                              GLenum internal_format,
+                              bool immutable);
 
   static bool TextureFilterable(const FeatureInfo* feature_info,
                                 GLenum internal_format,
-                                GLenum type);
+                                GLenum type,
+                                bool immutable);
 
   // Sets the Texture's target
   // Parameters: