Add hints for potential overlay promotion on android.

cc/ipc/transferable_resource_struct_traits.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_IPC_TRANSFERABLE_RESOURCE_STRUCT_TRAITS_H_
 #define CC_IPC_TRANSFERABLE_RESOURCE_STRUCT_TRAITS_H_
 
 #include "cc/ipc/transferable_resource.mojom-shared.h"
 #include "cc/resources/transferable_resource.h"
 
@@ skipping 30 matching lines @@
   }
 
   static bool is_software(const cc::TransferableResource& resource) {
     return resource.is_software;
   }
 
   static bool is_overlay_candidate(const cc::TransferableResource& resource) {
     return resource.is_overlay_candidate;
   }
 
+  static bool is_backed_by_surface_texture(
+      const cc::TransferableResource& resource) {
+#if defined(OS_ANDROID)
+    // TransferableResource has this in an #ifdef, but mojo doesn't leta us.

[dcheng, 2016/12/07 03:34:50]

Mind marking this with TODO(https://crbug.com/671901) (and the below one as
well)?

[liberato (no reviews please), 2016/12/07 17:38:29]

done, + leta.

+    return resource.is_backed_by_surface_texture;
+#else
+    return false;
+#endif
+  }
+
+  static bool wants_promotion_hint(const cc::TransferableResource& resource) {
+#if defined(OS_ANDROID)
+    // TransferableResource has this in an #ifdef, but mojo doesn't leta us.
+    return resource.wants_promotion_hint;
+#else
+    return false;
+#endif
+  }
+
   static bool Read(cc::mojom::TransferableResourceDataView data,
                    cc::TransferableResource* out);
 };
 
 }  // namespace mojo
 
 #endif  // CC_IPC_TRANSFERABLE_RESOURCE_STRUCT_TRAITS_H_