Add GL_TEXTURE_EXTERNAL_OES as supported texture target for CHROMIUM_map_image.

ui/gl/gl_image_shm.h

Index: ui/gl/gl_image_shm.h
diff --git a/ui/gl/gl_image_shm.h b/ui/gl/gl_image_shm.h
index fea9d33df5713669eeac0ca8a2f8114b7a675a20..bc514ffdae64fb9a38170ea6b056ca964180a272 100644
--- a/ui/gl/gl_image_shm.h
+++ b/ui/gl/gl_image_shm.h
@@ -6,6 +6,7 @@
 #define UI_GL_GL_IMAGE_SHM_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_image.h"
 
 namespace gfx {
@@ -33,6 +34,8 @@ class GL_EXPORT GLImageShm : public GLImage {
   scoped_ptr<base::SharedMemory> shared_memory_;
   gfx::Size size_;
   unsigned internalformat_;
+  GLuint egl_texture_id_;
+  EGLImageKHR egl_image_;
 
   DISALLOW_COPY_AND_ASSIGN(GLImageShm);
 };