Add support for EXT_image_flush_external extension

ui/gl/gl_image_ozone_native_pixmap.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/buffer_format_util.h"
+#include "ui/gl/gl_fence.h"
 #include "ui/gl/gl_image_ozone_native_pixmap.h"
 
 #define FOURCC(a, b, c, d)                                        \
   ((static_cast<uint32_t>(a)) | (static_cast<uint32_t>(b) << 8) | \
    (static_cast<uint32_t>(c) << 16) | (static_cast<uint32_t>(d) << 24))
 
 #define DRM_FORMAT_R8 FOURCC('R', '8', ' ', ' ')
 #define DRM_FORMAT_RGB565 FOURCC('R', 'G', '1', '6')
 #define DRM_FORMAT_ARGB8888 FOURCC('A', 'R', '2', '4')
 #define DRM_FORMAT_ABGR8888 FOURCC('A', 'B', '2', '4')
@@ skipping 219 matching lines @@
     case gfx::BufferFormat::YUV_420_BIPLANAR:
     case gfx::BufferFormat::UYVY_422:
       NOTREACHED();
       return GL_NONE;
   }
 
   NOTREACHED();
   return GL_NONE;
 }
 
+void GLImageOzoneNativePixmap::Flush() {
+  const EGLint attribs[] = {EGL_IMAGE_EXTERNAL_TARGET_NVX, EGL_DECOMPRESSED_NVX,
+                            EGL_NONE};
+
+  EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+  if (!eglImageFlushExternalEXT(display, egl_image_, attribs)) {
+    LOG(ERROR) << "Failed to flush rendering";
+    return;
+  }
+
+  GLFence* fence = GLFence::Create();
+  fence->ClientWait();
+  delete fence;
+}
+
 }  // namespace gl