gpu: Add CHROMIUM_texture_from_image spec and fence support.

ui/gl/gl_image_egl.cc

 // Copyright (c) 2013 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/gl/gl_image_egl.h"
 
 #include "ui/gl/egl_util.h"
+#include "ui/gl/gl_fence.h"
 #include "ui/gl/gl_surface_egl.h"
 
 namespace gl {
 
 GLImageEGL::GLImageEGL(const gfx::Size& size)
     : egl_image_(EGL_NO_IMAGE_KHR), size_(size) {}
 
 GLImageEGL::~GLImageEGL() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (egl_image_ != EGL_NO_IMAGE_KHR) {
@@ skipping 20 matching lines @@
 
   return true;
 }
 
 gfx::Size GLImageEGL::GetSize() {
   return size_;
 }
 
 unsigned GLImageEGL::GetInternalFormat() { return GL_RGBA; }
 
-bool GLImageEGL::BindTexImage(unsigned target) {
+bool GLImageEGL::BindTexImage(unsigned target, GLFence* fence) {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (egl_image_ == EGL_NO_IMAGE_KHR)
     return false;
 
+  // Prevent image from being used before |fence| has signaled.
+  // Note: Fence implementations are allowed to use a client side wait
+  // when server side wait is not supported.
+  if (fence)
+    fence->ServerWait();
+
   glEGLImageTargetTexture2DOES(target, egl_image_);
   DCHECK_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
   return true;
 }
 
 bool GLImageEGL::CopyTexImage(unsigned target) {
   return false;
 }
 
 bool GLImageEGL::CopyTexSubImage(unsigned target,
                                  const gfx::Point& offset,
                                  const gfx::Rect& rect) {
   return false;
 }
 
 bool GLImageEGL::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                       int z_order,
                                       gfx::OverlayTransform transform,
                                       const gfx::Rect& bounds_rect,
                                       const gfx::RectF& crop_rect) {
   return false;
 }
 
 }  // namespace gl