Partial raster for GPU

cc/raster/one_copy_raster_buffer_provider.cc

Index: cc/raster/one_copy_raster_buffer_provider.cc
diff --git a/cc/raster/one_copy_raster_buffer_provider.cc b/cc/raster/one_copy_raster_buffer_provider.cc
index 44e38458cb05731b40a769f3a390a7b10bd40c85..f0f6b0f36b0dff08cc366b714cd47eea726680c9 100644
--- a/cc/raster/one_copy_raster_buffer_provider.cc
+++ b/cc/raster/one_copy_raster_buffer_provider.cc
@@ -153,8 +153,11 @@ bool OneCopyRasterBufferProvider::IsResourceSwizzleRequired(
   return ResourceFormatRequiresSwizzle(GetResourceFormat(must_support_alpha));
 }
 
-bool OneCopyRasterBufferProvider::IsPartialRasterSupported() const {
-  return true;
+bool OneCopyRasterBufferProvider::CanPartialRasterIntoProvidedResource() const {
+  // While OneCopyRasterBufferProvider has an internal partial raster
+  // implementation, it cannot directly partial raster into the externally
+  // owned resource provided in AcquireBufferForRaster.
+  return false;
 }
 
 void OneCopyRasterBufferProvider::Shutdown() {