ui: Add EGL_ANDROID_native_fence_sync support.

ui/gl/gl_fence.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_GL_GL_FENCE_H_
 #define UI_GL_GL_FENCE_H_
 
 #include "base/macros.h"
 #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> {
  public:
   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;
 
   // Will block the server if supported, but might fall back to blocking the
   // client.
   virtual void ServerWait() = 0;
 
   // Returns true if re-setting state is supported.
   virtual bool ResetSupported();
@@ skipping 15 matching lines @@
 
  private:
   friend class base::RefCounted<GLFence>;
 
   DISALLOW_COPY_AND_ASSIGN(GLFence);
 };
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_FENCE_H_