Move Mailbox from cc to gpu, and its traits to gpu/ipc

cc/texture_mailbox.h

Index: cc/texture_mailbox.h
diff --git a/cc/texture_mailbox.h b/cc/texture_mailbox.h
index 95bf170ee0137f3fd475164e8532e7e5026b45b5..9314ddd9b945aad7cb828080eccea5d292c5598b 100644
--- a/cc/texture_mailbox.h
+++ b/cc/texture_mailbox.h
@@ -10,7 +10,7 @@
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "cc/cc_export.h"
-#include "cc/transferable_resource.h"
+#include "gpu/command_buffer/common/mailbox.h"
 
 namespace cc {
 
@@ -20,9 +20,9 @@ class CC_EXPORT TextureMailbox {
   TextureMailbox();
   TextureMailbox(const std::string& mailbox_name,
                  const ReleaseCallback& callback);
-  TextureMailbox(const Mailbox& mailbox_name,
+  TextureMailbox(const gpu::Mailbox& mailbox_name,
                  const ReleaseCallback& callback);
-  TextureMailbox(const Mailbox& mailbox_name,
+  TextureMailbox(const gpu::Mailbox& mailbox_name,
                  const ReleaseCallback& callback,
                  unsigned sync_point);
 
@@ -30,17 +30,17 @@ class CC_EXPORT TextureMailbox {
 
   const ReleaseCallback& callback() const { return callback_; }
   const int8* data() const { return name_.name; }
-  bool Equals(const Mailbox&) const;
+  bool Equals(const gpu::Mailbox&) const;
   bool Equals(const TextureMailbox&) const;
   bool IsEmpty() const;
-  const Mailbox& name() const { return name_; }
+  const gpu::Mailbox& name() const { return name_; }
   void ResetSyncPoint() { sync_point_ = 0; }
   void RunReleaseCallback(unsigned sync_point) const;
-  void SetName(const Mailbox&);
+  void SetName(const gpu::Mailbox&);
   unsigned sync_point() const { return sync_point_; }
 
  private:
-  Mailbox name_;
+  gpu::Mailbox name_;
   ReleaseCallback callback_;
   unsigned sync_point_;
 };