third_party: Switch to zcr prefix for downstream wayland interfaces.

third_party/wayland-protocols/unstable/alpha-compositing/alpha-compositing-unstable-v1.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <protocol name="alpha_compositing_unstable_v1">
 
   <copyright>
     Copyright 2016 The Chromium Authors.
 
     Permission is hereby granted, free of charge, to any person obtaining a
     copy of this software and associated documentation files (the "Software"),
     to deal in the Software without restriction, including without limitation
     the rights to use, copy, modify, merge, publish, distribute, sublicense,
@@ skipping 20 matching lines @@
     Warning! The protocol described in this file is experimental and backward
     incompatible changes may be made. Backward compatible changes may be added
     together with the corresponding interface version bump. Backward
     incompatible changes are done by bumping the version number in the protocol
     and interface names and resetting the interface version. Once the protocol
     is to be declared stable, the 'z' prefix and the version number in the
     protocol and interface names are removed and the interface version number is
     reset.
   </description>
 
-  <interface name="zwp_alpha_compositing_v1" version="1">
+  <interface name="zcr_alpha_compositing_v1" version="1">
     <description summary="alpha_compositing">
       The global interface exposing compositing and blending capabilities is
       used to instantiate an interface extension for a wl_surface object.
       This extended interface will then allow the client to specify the
       blending equation and alpha value used for compositing the wl_surface.
     </description>
 
     <request name="destroy" type="destructor">
       <description summary="unbind from the blending interface">
         Informs the server that the client will not be using this
         protocol object anymore. This does not affect any other objects,
         blending objects included.
       </description>
     </request>
 
     <enum name="error">
       <entry name="blending_exists" value="0"
              summary="the surface already has a blending object associated"/>
     </enum>
 
     <request name="get_blending">
       <description summary="extend surface interface for blending">
         Instantiate an interface extension for the given wl_surface to
         provide surface blending. If the given wl_surface already has
         a blending object associated, the blending_exists protocol error
         is raised.
       </description>
 
+      <arg name="id" type="new_id" interface="zcr_blending_v1"
+           summary="the new blending interface id"/>
+      <arg name="surface" type="object" interface="wl_surface"
+           summary="the surface"/>
+    </request>
+  </interface>
+
+  <interface name="zcr_blending_v1" version="1">
+    <description summary="blending interface to a wl_surface">
+      An additional interface to a wl_surface object, which allows the
+      client to specify the blending equation used for compositing and
+      an alpha value applied to the whole surface.
+
+      If the wl_surface associated with the bledning object is destroyed,
+      the blending object becomes inert.
+
+      If the blending object is destroyed, the blending state is removed
+      from the wl_surface. The change will be applied on the next
+      wl_surface.commit.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="remove blending from the surface">
+        The associated wl_surface's blending state is removed.
+        The change is applied on the next wl_surface.commit.
+      </description>
+    </request>
+
+    <enum name="blending_equation">
+      <description summary="different blending equations for compositing">
+        Blending equations that can be used when compositing a surface.
+      </description>
+      <entry name="none" value="0" summary="no blending"/>
+      <entry name="premult" value="1" summary="one / one_minus_src_alpha"/>
+      <entry name="coverage" value="2" summary="src_alpha / one_minus_src_alpha" />
+    </enum>
+
+    <request name="set_blending">
+      <description summary="set the blending equation">
+        Set the blending equation for compositing the wl_surface.
+        See wp_alpha_compositing for the description.
+
+        The blending equation state is double-buffered state,
+        and will be applied on the next wl_surface.commit.
+      </description>
+      <arg name="equation" type="uint" summary="the new blending equation"/>
+    </request>
+
+    <request name="set_alpha">
+      <description summary="set the alpha value">
+        Set the alpha value applied to the whole surface for compositing.
+        See wp_alpha_compositing for the description.
+
+        The alpha value state is double-buffered state,
+        and will be applied on the next wl_surface.commit.
+      </description>
+      <arg name="value" type="fixed" summary="the new alpha value"/>
+    </request>
+
+  </interface>
+
+  <interface name="zwp_alpha_compositing_v1" version="1">
+    <description summary="DEPRECATED">
+      The global interface exposing compositing and blending capabilities is
+      used to instantiate an interface extension for a wl_surface object.
+      This extended interface will then allow the client to specify the
+      blending equation and alpha value used for compositing the wl_surface.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="unbind from the blending interface">
+        Informs the server that the client will not be using this
+        protocol object anymore. This does not affect any other objects,
+        blending objects included.
+      </description>
+    </request>
+
+    <enum name="error">
+      <entry name="blending_exists" value="0"
+             summary="the surface already has a blending object associated"/>
+    </enum>
+
+    <request name="get_blending">
+      <description summary="extend surface interface for blending">
+        Instantiate an interface extension for the given wl_surface to
+        provide surface blending. If the given wl_surface already has
+        a blending object associated, the blending_exists protocol error
+        is raised.
+      </description>
+
       <arg name="id" type="new_id" interface="zwp_blending_v1"
            summary="the new blending interface id"/>
       <arg name="surface" type="object" interface="wl_surface"
            summary="the surface"/>
     </request>
   </interface>
 
   <interface name="zwp_blending_v1" version="1">
-    <description summary="blending interface to a wl_surface">
+    <description summary="DEPRECATED">
       An additional interface to a wl_surface object, which allows the
       client to specify the blending equation used for compositing and
       an alpha value applied to the whole surface.
 
       If the wl_surface associated with the bledning object is destroyed,
       the blending object becomes inert.
 
       If the blending object is destroyed, the blending state is removed
       from the wl_surface. The change will be applied on the next
       wl_surface.commit.
@@ skipping 32 matching lines @@
         See wp_alpha_compositing for the description.
 
         The alpha value state is double-buffered state,
         and will be applied on the next wl_surface.commit.
       </description>
       <arg name="value" type="fixed" summary="the new alpha value"/>
     </request>
 
   </interface>
 </protocol>