ui: Add EGL_ANDROID_native_fence_sync support.

ui/gl/gl_fence.cc

Index: ui/gl/gl_fence.cc
diff --git a/ui/gl/gl_fence.cc b/ui/gl/gl_fence.cc
index e69d4cf144dca6c4e298885b29e6cd8accd317c3..9bb071d6c4f799d5e0de9afbb7521d20b16fa7ac 100644
--- a/ui/gl/gl_fence.cc
+++ b/ui/gl/gl_fence.cc
@@ -6,11 +6,13 @@
 
 #include "base/compiler_specific.h"
 #include "build/build_config.h"
+#include "ui/gfx/gpu_fence.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_fence_arb.h"
 #include "ui/gl/gl_fence_egl.h"
 #include "ui/gl/gl_fence_nv.h"
+#include "ui/gl/gl_fence_shared_event.h"
 #include "ui/gl/gl_gl_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_version_info.h"
@@ -19,6 +21,10 @@
 #include "ui/gl/gl_fence_apple.h"
 #endif
 
+#if defined(OS_LINUX)
+#include "ui/gl/gl_fence_libsync.h"
+#endif
+
 namespace gl {
 
 GLFence::GLFence() {
@@ -70,6 +76,34 @@ scoped_refptr<GLFence> GLFence::Create() {
   return fence;
 }
 
+scoped_refptr<GLFence> GLFence::CreateFromGpuFenceHandle(
+    const gfx::GpuFenceHandle& handle) {
+  DCHECK(GLContext::GetCurrent()) << "Trying to create fence with no context";
+
+  scoped_refptr<GLFence> fence;
+#if defined(OS_LINUX)
+  base::ScopedFD fence_fd(handle.fd.fd);
+  if (fence_fd.is_valid()) {
+    if (g_driver_egl.ext.b_EGL_ANDROID_native_fence_sync) {
+      EGLint attribs[] = {EGL_SYNC_NATIVE_FENCE_FD_ANDROID, fence_fd.release(),
+                          EGL_NONE};
+      fence = make_scoped_refptr(
+          new GLFenceEGL(EGL_SYNC_NATIVE_FENCE_ANDROID, attribs));
+    } else {
+      fence = make_scoped_refptr(new GLFenceLibsync(std::move(fence_fd)));
+    }
+  } else {
+    fence =
+        make_scoped_refptr(new GLFenceSharedEvent(handle.shared_event_handle));
+  }
+#else
+  fence =
+      make_scoped_refptr(new GLFenceSharedEvent(handle.shared_event_handle));
+#endif
+
+  return fence;
+}
+
 bool GLFence::ResetSupported() {
   // Resetting a fence to its original state isn't supported by default.
   return false;