gpu: Add CHROMIUM_texture_from_image spec and fence support.

ui/gl/gl_image_egl.cc

Index: ui/gl/gl_image_egl.cc
diff --git a/ui/gl/gl_image_egl.cc b/ui/gl/gl_image_egl.cc
index 181999997ea4cdfd484704ad7b6e0caf27ecd131..0d1d1e1ab67687640bfe7049b5ae873efce47770 100644
--- a/ui/gl/gl_image_egl.cc
+++ b/ui/gl/gl_image_egl.cc
@@ -5,6 +5,7 @@
 #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 {
@@ -45,11 +46,17 @@ gfx::Size GLImageEGL::GetSize() {
 
 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;