Implement new defaults for Texture::CreateView

https://github.com/gpuweb/gpuweb/pull/389 except for removing createDefaultView
https://github.com/gpuweb/gpuweb/pull/407

This will need to slightly change again when
https://github.com/gpuweb/gpuweb/pull/424 lands.

Bug: dawn:214
Change-Id: Id904b55cea6d77fcf7d971bd743468c7d82a9aa8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/10440
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>

generator/dawn_json_generator.py

@@ -61,11 +61,11 @@ class Type:
         self.name = Name(name, native=native)
         self.category = json_data['category']
 
-EnumValue = namedtuple('EnumValue', ['name', 'value'])
+EnumValue = namedtuple('EnumValue', ['name', 'value', 'valid'])
 class EnumType(Type):
     def __init__(self, name, json_data):
         Type.__init__(self, name, json_data)
-        self.values = [EnumValue(Name(m['name']), m['value']) for m in self.json_data['values']]
+        self.values = [EnumValue(Name(m['name']), m['value'], m.get('valid', True)) for m in self.json_data['values']]
 
         # Assert that all values are unique in enums
         all_values = set()

generator/templates/dawn_native/ValidationUtils.cpp

@@ -19,7 +19,7 @@ namespace dawn_native {
     {% for type in by_category["enum"] %}
         MaybeError Validate{{type.name.CamelCase()}}(dawn::{{as_cppType(type.name)}} value) {
             switch (value) {
-                {% for value in type.values %}
+                {% for value in type.values if value.valid %}
                     case dawn::{{as_cppType(type.name)}}::{{as_cppEnum(value.name)}}:
                         return {};
                 {% endfor %}