Add NativePixmapDmabufStub to finalize glCreateImageCHROMIUM on Linux.

gpu/ipc/service/gpu_memory_buffer_factory_native_pixmap.cc

Index: gpu/ipc/service/gpu_memory_buffer_factory_native_pixmap.cc
diff --git a/gpu/ipc/service/gpu_memory_buffer_factory_native_pixmap.cc b/gpu/ipc/service/gpu_memory_buffer_factory_native_pixmap.cc
index 77b68af8f821f0bcc14af12ae00e757fe4d1df53..b89aea8485cf0dea67f88f7809fda68c520d59f9 100644
--- a/gpu/ipc/service/gpu_memory_buffer_factory_native_pixmap.cc
+++ b/gpu/ipc/service/gpu_memory_buffer_factory_native_pixmap.cc
@@ -11,6 +11,8 @@
 #if defined(USE_OZONE)
 #include "ui/ozone/public/ozone_platform.h"
 #include "ui/ozone/public/surface_factory_ozone.h"
+#elif defined(OS_LINUX)
+#include "ui/gfx/linux/native_pixmap_dmabuf_stub.h"
 #endif
 
 namespace gpu {
@@ -101,8 +103,8 @@ GpuMemoryBufferFactoryNativePixmap::CreateImageForGpuMemoryBuffer(
                  ->CreateNativePixmapFromHandle(surface_handle, size, format,
                                                 handle.native_pixmap_handle);
 #else
-    // TODO(j.isorce): implement this to enable glCreateImageCHROMIUM on Linux.
-    NOTIMPLEMENTED();
+    pixmap = new ui::NativePixmapDmaBufStub(size, format,

[reveman, 2017/04/12 18:21:36]

should we be using make_scoped_refptr here to make it more explicit that this is
ref counted?

[Julien Isorce, 2017/04/13 12:46:02]

Sure, I will do it.

+                                            handle.native_pixmap_handle);
 #endif
     if (!pixmap.get()) {
       DLOG(ERROR) << "Failed to create pixmap from handle";