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_image_ozone_native_pixmap.h"
 #include "ui/gl/gl_surface_egl.h"
 
 #define FOURCC(a, b, c, d)                                        \
   ((static_cast<uint32_t>(a)) | (static_cast<uint32_t>(b) << 8) | \
@@ skipping 83 matching lines @@
   }
 
   NOTREACHED();
   return 0;
 }
 
 }  // namespace
 
 GLImageOzoneNativePixmap::GLImageOzoneNativePixmap(const gfx::Size& size,
                                                    unsigned internalformat)
-    : GLImageEGL(size), internalformat_(internalformat) {}
+    : GLImageEGL(size),
+      internalformat_(internalformat),
+      has_image_flush_external_(
+          GLSurfaceEGL::HasEGLExtension("EGL_EXT_image_flush_external")) {}
 
 GLImageOzoneNativePixmap::~GLImageOzoneNativePixmap() {
 }
 
 bool GLImageOzoneNativePixmap::Initialize(ui::NativePixmap* pixmap,
                                           gfx::BufferFormat format) {
   DCHECK(!pixmap_);
   if (pixmap->GetEGLClientBuffer()) {
     EGLint attrs[] = {EGL_IMAGE_PRESERVED_KHR, EGL_TRUE, EGL_NONE};
     if (!GLImageEGL::Initialize(EGL_NATIVE_PIXMAP_KHR,
@@ skipping 86 matching lines @@
     gfx::AcceleratedWidget widget,
     int z_order,
     gfx::OverlayTransform transform,
     const gfx::Rect& bounds_rect,
     const gfx::RectF& crop_rect) {
   DCHECK(pixmap_);
   return pixmap_->ScheduleOverlayPlane(widget, z_order, transform, bounds_rect,
                                        crop_rect);
 }
 
+void GLImageOzoneNativePixmap::Flush() {
+  if (has_image_flush_external_) {

[liberato (no reviews please), 2016/07/14 14:38:35]

random nit: can early out and avoid the indent.

+    EGLDisplay display = GLSurfaceEGL::GetHardwareDisplay();
+    const EGLAttrib attribs[] = {
+        EGL_NONE,
+    };
+    if (!eglImageFlushExternalEXT(display, egl_image_, attribs)) {
+      LOG(ERROR) << "Failed to flush rendering";
+      return;
+    }
+  }
+}
+
 void GLImageOzoneNativePixmap::OnMemoryDump(
     base::trace_event::ProcessMemoryDump* pmd,
     uint64_t process_tracing_id,
     const std::string& dump_name) {
   // TODO(ericrk): Implement GLImage OnMemoryDump. crbug.com/514914
 }
 
 // static
 unsigned GLImageOzoneNativePixmap::GetInternalFormatForTesting(
     gfx::BufferFormat format) {
@@ skipping 20 matching lines @@
     case gfx::BufferFormat::UYVY_422:
       NOTREACHED();
       return GL_NONE;
   }
 
   NOTREACHED();
   return GL_NONE;
 }
 
 }  // namespace gl