Don't put timers with ID == 0 into the global timer map.

fpdfsdk/fpdfformfill_embeddertest.cpp

Index: fpdfsdk/fpdfformfill_embeddertest.cpp
diff --git a/fpdfsdk/fpdfformfill_embeddertest.cpp b/fpdfsdk/fpdfformfill_embeddertest.cpp
index baf4853f173d746be8635af713be4a5ef560f1ce..47f1a75efb87b8fa6dfd23762a03d57acda65e88 100644
--- a/fpdfsdk/fpdfformfill_embeddertest.cpp
+++ b/fpdfsdk/fpdfformfill_embeddertest.cpp
@@ -179,4 +179,21 @@ TEST_F(FPDFFormFillEmbeddertest, BUG_634716) {
   EXPECT_EQ(2U, alerts.size());
 }
 
+TEST_F(FPDFFormFillEmbeddertest, BUG_679649) {
+  EmbedderTestTimerHandlingDelegate delegate;
+  SetDelegate(&delegate);
+
+  EXPECT_TRUE(OpenDocument("bug_679649.pdf"));
+  FPDF_PAGE page = LoadPage(0);
+  EXPECT_TRUE(page);
+
+  delegate.SetFailNextTimer();
+  DoOpenActions();
+  delegate.AdvanceTime(2000);
+  UnloadPage(page);
+
+  const auto& alerts = delegate.GetAlerts();
+  EXPECT_EQ(0u, alerts.size());
+}
+
 #endif  // PDF_ENABLE_V8