gpu: Remove Echo and SwapCompletion GL interfacess

content/renderer/pepper/ppb_graphics_3d_impl.cc

Index: content/renderer/pepper/ppb_graphics_3d_impl.cc
diff --git a/content/renderer/pepper/ppb_graphics_3d_impl.cc b/content/renderer/pepper/ppb_graphics_3d_impl.cc
index 7486abce9ff90024dcc8938491f6c0ac378506e2..7111f56a7472e51ab3418868ad712505d086d978 100644
--- a/content/renderer/pepper/ppb_graphics_3d_impl.cc
+++ b/content/renderer/pepper/ppb_graphics_3d_impl.cc
@@ -200,8 +200,10 @@ int32 PPB_Graphics3D_Impl::DoSwapBuffers() {
     commit_pending_ = true;
   } else {
     // Wait for the command to complete on the GPU to allow for throttling.
-    command_buffer_->Echo(base::Bind(&PPB_Graphics3D_Impl::OnSwapBuffers,
-                                     weak_ptr_factory_.GetWeakPtr()));
+    command_buffer_->SignalSyncPoint(
+        sync_point_,
+        base::Bind(&PPB_Graphics3D_Impl::OnSwapBuffers,
+                   weak_ptr_factory_.GetWeakPtr()));
   }
 
   return PP_OK_COMPLETIONPENDING;