gpu: Add out-of-line copy ctors for complex classes.

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 2f49c3a451b5d7605f7de83e34ce224a5b3b7d40..8dd7ce108d455e354a4ba06ec9920319f169a2b8 100644
--- a/gpu/command_buffer/service/texture_definition.h
+++ b/gpu/command_buffer/service/texture_definition.h
@@ -48,6 +48,7 @@ class TextureDefinition {
   TextureDefinition(Texture* texture,
                     unsigned int version,
                     const scoped_refptr<NativeImageBuffer>& image);
+  TextureDefinition(const TextureDefinition& other);
   virtual ~TextureDefinition();
 
   Texture* CreateTexture() const;
@@ -77,6 +78,7 @@ class TextureDefinition {
               GLenum format,
               GLenum type,
               const gfx::Rect& cleared_rect);
+    LevelInfo(const LevelInfo& other);
     ~LevelInfo();
 
     GLenum target;