fix the bugs of getSyncParameter in gl-object-get-calls.html

gpu/blink/webgraphicscontext3d_impl.h

Index: gpu/blink/webgraphicscontext3d_impl.h
diff --git a/gpu/blink/webgraphicscontext3d_impl.h b/gpu/blink/webgraphicscontext3d_impl.h
index a7cc29070d0a018d1fcd07e36b7d38adbc5e132b..b5c7d533584f44be263587ba1364dede8ce819ea 100644
--- a/gpu/blink/webgraphicscontext3d_impl.h
+++ b/gpu/blink/webgraphicscontext3d_impl.h
@@ -227,6 +227,12 @@ class GPU_BLINK_EXPORT WebGraphicsContext3DImpl
   blink::WebString getShaderSource(blink::WebGLId shader) override;
   blink::WebString getString(blink::WGC3Denum name) override;
 
+  void getSynciv(blink::WGC3Dsync sync,
+                 blink::WGC3Denum pname,
+                 blink::WGC3Dsizei bufSize,
+                 blink::WGC3Dsizei *length,
+                 blink::WGC3Dint *params) override;
+
   void getTexParameterfv(blink::WGC3Denum target,
                          blink::WGC3Denum pname,
                          blink::WGC3Dfloat* value) override;