GPU: Adding sync points for cross-channel synchronization

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc

Index: content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
index e59a87e32e6f61f0f11025ed37904e8af37b02d5..b8b89502e51deb5d5f3595fd3b9f771168f8230d 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
+++ b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.cc
@@ -426,6 +426,17 @@ bool WebGraphicsContext3DCommandBufferImpl::setParentContext(
   return SetParent(parent_context_impl);
 }
 
+unsigned int WebGraphicsContext3DCommandBufferImpl::insertSyncPoint() {
+  gl_->helper()->CommandBufferHelper::Flush();
+  return command_buffer_->InsertSyncPoint();
+}
+
+void WebGraphicsContext3DCommandBufferImpl::waitSyncPoint(
+    unsigned int sync_point) {
+  gl_->helper()->CommandBufferHelper::Flush();
+  command_buffer_->WaitSyncPoint(sync_point);
+}
+
 bool WebGraphicsContext3DCommandBufferImpl::SetParent(
     WebGraphicsContext3DCommandBufferImpl* new_parent) {
   if (parent_ == new_parent)