ui: Add EGL_ANDROID_native_fence_sync support.

ui/gl/gl_fence.h

Index: ui/gl/gl_fence.h
diff --git a/ui/gl/gl_fence.h b/ui/gl/gl_fence.h
index 0f055273bf5d39557e38a74b59745c00b27a2b61..df87657b0b15df24c167a8881156bd3a6b2b643c 100644
--- a/ui/gl/gl_fence.h
+++ b/ui/gl/gl_fence.h
@@ -9,6 +9,10 @@
 #include "base/memory/ref_counted.h"
 #include "ui/gl/gl_export.h"
 
+namespace gfx {
+struct GpuFenceHandle;
+}
+
 namespace gl {
 
 class GL_EXPORT GLFence : public base::RefCounted<GLFence> {
@@ -17,6 +21,8 @@ class GL_EXPORT GLFence : public base::RefCounted<GLFence> {
 
   static bool IsSupported();
   static scoped_refptr<GLFence> Create();
+  static scoped_refptr<GLFence> CreateFromGpuFenceHandle(
+      const gfx::GpuFenceHandle& handle);
 
   virtual bool HasCompleted() = 0;
   virtual void ClientWait() = 0;