gpu: Remove Create/DeleteImage IPC by adding an X11_PIXMAP_BUFFER GpuMemoryBuffer type.

ui/gfx/gpu_memory_buffer.h

Index: ui/gfx/gpu_memory_buffer.h
diff --git a/ui/gfx/gpu_memory_buffer.h b/ui/gfx/gpu_memory_buffer.h
index 1a622016c7c003f212ec8428f96cf3f1ae0cedba..8c131230cce3dc213d5e46247c315ebb9c850bb6 100644
--- a/ui/gfx/gpu_memory_buffer.h
+++ b/ui/gfx/gpu_memory_buffer.h
@@ -13,6 +13,10 @@
 #include <third_party/khronos/EGL/egl.h>
 #endif
 
+#if defined(USE_X11)
+#include "ui/gfx/x/x11_types.h"
+#endif
+
 namespace gfx {
 
 enum GpuMemoryBufferType {
@@ -21,7 +25,8 @@ enum GpuMemoryBufferType {
   IO_SURFACE_BUFFER,
   ANDROID_NATIVE_BUFFER,
   SURFACE_TEXTURE_BUFFER,
-  GPU_MEMORY_BUFFER_TYPE_LAST = SURFACE_TEXTURE_BUFFER
+  X11_PIXMAP_BUFFER,
+  GPU_MEMORY_BUFFER_TYPE_LAST = X11_PIXMAP_BUFFER
 };
 
 // TODO(alexst): Merge this with GpuMemoryBufferId as part of switchover to
@@ -54,9 +59,11 @@ struct GFX_EXPORT GpuMemoryBufferHandle {
   uint32 io_surface_id;
 #endif
 #if defined(OS_ANDROID)
-  EGLClientBuffer native_buffer;
   SurfaceTextureId surface_texture_id;
 #endif
+#if defined(USE_X11)
+  XID pixmap;
+#endif
 };
 
 // This interface typically correspond to a type of shared memory that is also