Send vsync timebase updates to the browser compositor

ui/gl/gl_surface_glx.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_SURFACE_GLX_H_
 #define UI_GL_GL_SURFACE_GLX_H_
 
 #include "base/compiler_specific.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 10 matching lines @@
 
   static bool InitializeOneOff();
 
   // These aren't particularly tied to surfaces, but since we already
   // have the static InitializeOneOff here, it's easiest to reuse its
   // initialization guards.
   static const char* GetGLXExtensions();
   static bool HasGLXExtension(const char* name);
   static bool IsCreateContextRobustnessSupported();
   static bool IsTextureFromPixmapSupported();
+  static bool IsOMLSyncControlSupported();
 
   virtual void* GetDisplay() OVERRIDE;
 
   // Get the FB config that the surface was created with or NULL if it is not
   // a GLX drawable.
   virtual void* GetConfig() = 0;
 
  protected:
   virtual ~GLSurfaceGLX();
 
@@ skipping 10 matching lines @@
   virtual bool Initialize() OVERRIDE;
   virtual void Destroy() OVERRIDE;
   virtual bool Resize(const gfx::Size& size) OVERRIDE;
   virtual bool IsOffscreen() OVERRIDE;
   virtual bool SwapBuffers() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual void* GetHandle() OVERRIDE;
   virtual std::string GetExtensions() OVERRIDE;
   virtual void* GetConfig() OVERRIDE;
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
+  virtual bool GetVSyncParameters(base::TimeTicks* timebase,
+                                  base::TimeDelta* interval) OVERRIDE;
 
  protected:
   NativeViewGLSurfaceGLX();
   virtual ~NativeViewGLSurfaceGLX();
 
   gfx::AcceleratedWidget window_;
 
  private:
   void* config_;
   gfx::Size size_;
@@ skipping 22 matching lines @@
   gfx::Size size_;
   void* config_;
   XID pbuffer_;
 
   DISALLOW_COPY_AND_ASSIGN(PbufferGLSurfaceGLX);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GL_GL_SURFACE_GLX_H_