Send vsync timebase updates to the browser compositor

ui/gl/gl_surface.cc

Index: ui/gl/gl_surface.cc
diff --git a/ui/gl/gl_surface.cc b/ui/gl/gl_surface.cc
index a05eae85e3de3d4fc7afd0a64123bd80a9c28eec..cd22c26a70184f106684b2bcf853edebe0127db1 100644
--- a/ui/gl/gl_surface.cc
+++ b/ui/gl/gl_surface.cc
@@ -147,6 +147,12 @@ unsigned GLSurface::GetFormat() {
   return 0;
 }
 
+bool GLSurface::GetSyncValues(int64_t* systemTime,
+                              int64_t* mediaStreamCounter,
+                              int64_t* swapBufferCounter) {
+  return false;
+}
+
 GLSurface* GLSurface::GetCurrent() {
   return current_surface_.Pointer()->Get();
 }
@@ -251,6 +257,13 @@ unsigned GLSurfaceAdapter::GetFormat() {
   return surface_->GetFormat();
 }
 
+bool GLSurfaceAdapter::GetSyncValues(int64_t* systemTime,
+                                     int64_t* mediaStreamCounter,
+                                     int64_t* swapBufferCounter) {
+  return surface_->GetSyncValues(systemTime, mediaStreamCounter,
+                                 swapBufferCounter);
+}
+
 GLSurfaceAdapter::~GLSurfaceAdapter() {}
 
 }  // namespace gfx