Add a factory and defines for native Linux surfaces.

ui/surface/transport_dib.h

Index: ui/surface/transport_dib.h
diff --git a/ui/surface/transport_dib.h b/ui/surface/transport_dib.h
index 535567aec016a3ffffa7a2233d4f035cc19e018c..c07f21ece28991dc8df7abcb17c60f7b3cb4bff1 100644
--- a/ui/surface/transport_dib.h
+++ b/ui/surface/transport_dib.h
@@ -110,6 +110,19 @@ class SURFACE_EXPORT TransportDIB {
     static int fake_handle = 10;
     return fake_handle++;
   }
+#elif defined(USE_NATIVE_SURFACE_LINUX)
+  typedef int Handle;
+  typedef int Id;
+  // Returns a default, invalid handle, that is meant to indicate a missing
+  // Transport DIB.
+  static Handle DefaultHandleValue() { return -1; }
+
+  // Returns a value that is ONLY USEFUL FOR TESTS WHERE IT WON'T BE
+  // ACTUALLY USED AS A REAL HANDLE.
+  static Handle GetFakeHandleForTest() {
+    static int fake_handle = 10;
+    return fake_handle++;
+  }
 #else  // OS_POSIX
   typedef base::SharedMemoryHandle Handle;
   // On POSIX, the inode number of the backing file is used as an id.
@@ -198,7 +211,11 @@ class SURFACE_EXPORT TransportDIB {
   // Decreases the inflight counter, and deletes the transport DIB if it is
   // detached.
   void DecreaseInFlightCounter();
+#endif
 
+#if defined(TOOLKIT_GTK) || \
+  (defined(OS_LINUX) && defined(USE_AURA) && defined(USE_X11)) || \
+  defined(USE_NATIVE_SURFACE_LINUX)
   // Deletes this transport DIB and detaches the shared memory once the
   // |inflight_counter_| is zero.
   void Detach();