[cc] Fix LayerTreeHostTestBeginFrameSequenceNumbers.

cc/trees/layer_tree_host_unittest.cc

Index: cc/trees/layer_tree_host_unittest.cc
diff --git a/cc/trees/layer_tree_host_unittest.cc b/cc/trees/layer_tree_host_unittest.cc
index efc644aa68392c7d7f4e576c4b7dd95b23778df0..746cf3c143c3051f2f4aafbe215bddfa1a08dca8 100644
--- a/cc/trees/layer_tree_host_unittest.cc
+++ b/cc/trees/layer_tree_host_unittest.cc
@@ -7081,32 +7081,41 @@ class LayerTreeHostTestBeginFrameSequenceNumbers : public LayerTreeHostTest {
     return draw_result;
   }
 
-  void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
-    EXPECT_TRUE(frame_data_);
+  void DisplayReceivedCompositorFrameOnThread(
+      const CompositorFrame& frame) override {
+    if (compositor_frame_submitted_)
+      return;
+    compositor_frame_submitted_ = true;
+
     EXPECT_EQ(
         BeginFrameAck(current_begin_frame_args_.source_id,
                       current_begin_frame_args_.sequence_number,
                       current_begin_main_frame_args_on_impl_.sequence_number, 0,
                       true),
-        frame_data_->begin_frame_ack);
+        frame.metadata.begin_frame_ack);
   }
 
-  void DisplayReceivedCompositorFrameOnThread(
-      const CompositorFrame& frame) override {
-    compositor_frame_submitted_ = true;
+  void DrawLayersOnThread(LayerTreeHostImpl* impl) override {
+    if (layers_drawn_)
+      return;
+    layers_drawn_ = true;
+
+    EXPECT_TRUE(frame_data_);
+    EXPECT_TRUE(compositor_frame_submitted_);
     EXPECT_EQ(
         BeginFrameAck(current_begin_frame_args_.source_id,
                       current_begin_frame_args_.sequence_number,
                       current_begin_main_frame_args_on_impl_.sequence_number, 0,
                       true),
-        frame.metadata.begin_frame_ack);
+        frame_data_->begin_frame_ack);
     EndTest();
   }
 
-  void AfterTest() override { EXPECT_TRUE(compositor_frame_submitted_); }
+  void AfterTest() override { EXPECT_TRUE(layers_drawn_); }
 
  private:
-  bool compositor_frame_submitted_;
+  bool compositor_frame_submitted_ = false;
+  bool layers_drawn_ = false;
   BeginFrameArgs current_begin_frame_args_;
   BeginFrameArgs current_begin_main_frame_args_;
   BeginFrameArgs current_begin_main_frame_args_on_impl_;