Allow immutable textures into mailboxes

gpu/command_buffer/service/texture_definition.h

Index: gpu/command_buffer/service/texture_definition.h
diff --git a/gpu/command_buffer/service/texture_definition.h b/gpu/command_buffer/service/texture_definition.h
index 520c6f8f93090f1c553596cd62f5ae310d32b583..9ea9357bbc86c175a086647cb9244b90206ec44a 100644
--- a/gpu/command_buffer/service/texture_definition.h
+++ b/gpu/command_buffer/service/texture_definition.h
@@ -46,6 +46,7 @@ class GPU_EXPORT TextureDefinition {
 
   TextureDefinition(GLenum target,
                     GLuint service_id,
+                    bool immutable,
                     const LevelInfos& level_infos);
   ~TextureDefinition();
 
@@ -55,6 +56,8 @@ class GPU_EXPORT TextureDefinition {
 
   GLuint ReleaseServiceId();
 
+  bool immutable() const { return immutable_; }
+
   const LevelInfos& level_infos() const {
     return level_infos_;
   }
@@ -62,6 +65,7 @@ class GPU_EXPORT TextureDefinition {
  private:
   GLenum target_;
   GLuint service_id_;
+  bool immutable_;
   std::vector<std::vector<LevelInfo> > level_infos_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureDefinition);
@@ -71,5 +75,3 @@ class GPU_EXPORT TextureDefinition {
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_TEXTURE_DEFINITION_H_
-
-