Query if Texture subresource has been initialized

Bug: chromium:1036080
Change-Id: Ieb4c7012ae2d7d7b863c999756930b0ce45c06cb
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16422
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Natasha Lee <natlee@microsoft.com>

src/dawn_native/DawnNative.cpp

@@ -15,6 +15,7 @@
 #include "dawn_native/DawnNative.h"
 #include "dawn_native/Device.h"
 #include "dawn_native/Instance.h"
+#include "dawn_native/Texture.h"
 #include "dawn_platform/DawnPlatform.h"
 
 // Contains the entry-points into dawn_native
@@ -165,6 +166,17 @@ namespace dawn_native {
         return deviceBase->GetLazyClearCountForTesting();
     }
 
+    bool IsTextureSubresourceInitialized(WGPUTexture texture,
+                                         uint32_t baseMipLevel,
+                                         uint32_t levelCount,
+                                         uint32_t baseArrayLayer,
+                                         uint32_t layerCount) {
+        dawn_native::TextureBase* textureBase =
+            reinterpret_cast<dawn_native::TextureBase*>(texture);
+        return textureBase->IsSubresourceContentInitialized(baseMipLevel, levelCount,
+                                                            baseArrayLayer, layerCount);
+    }
+
     std::vector<const char*> GetProcMapNamesForTestingInternal();
 
     std::vector<const char*> GetProcMapNamesForTesting() {