Create nonzero_clear_resources_on_creation_for_testing toggle

Created toggle to force texture clearing to 1 bits in order to
test the logic of lazy clearing.

Bug: dawn:145
Change-Id: I83bc32f046159c709c426b77458fbdf115f7bfd0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/7120
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Natasha Lee <natlee@microsoft.com>

src/dawn_native/Instance.cpp

@@ -67,7 +67,13 @@ namespace dawn_native {
                "not support MTLStoreActionStoreAndMultisampleResolve. To support StoreOp::Store on "
                "those platforms, we should do MSAA resolve in another render pass after ending the "
                "previous one.",
-               "https://bugs.chromium.org/p/dawn/issues/detail?id=56"}}}};
+               "https://bugs.chromium.org/p/dawn/issues/detail?id=56"}},
+             {Toggle::NonzeroClearResourcesOnCreationForTesting,
+              {"nonzero_clear_resources_on_creation_for_testing",
+               "Clears texture to full 1 bits as soon as they are created, but doesn't update "
+               "the tracking state of the texture. This way we can test the logic of clearing "
+               "textures that use recycled memory.",
+               "https://bugs.chromium.org/p/dawn/issues/detail?id=145"}}}};
 
     }  // anonymous namespace