Implement sequence numbers for TestRenderViewHost

Change-Id: I8890216b416a3c035054c81336dc53334698fb78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362759
Commit-Queue: Clovis PJ <clovispj@google.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804205}

content/test/test_render_view_host.cc

@@ -144,6 +144,14 @@ void TestRenderWidgetHostView::WasOccluded() {
   is_occluded_ = true;
 }
 
+void TestRenderWidgetHostView::EnsureSurfaceSynchronizedForWebTest() {
+  ++latest_capture_sequence_number_;
+}
+
+uint32_t TestRenderWidgetHostView::GetCaptureSequenceNumber() const {
+  return latest_capture_sequence_number_;
+}
+
 void TestRenderWidgetHostView::RenderProcessGone() {
   delete this;
 }

content/test/test_render_view_host.h

@@ -93,9 +93,10 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase,
   void ResetFallbackToFirstNavigationSurface() override {}
 
   void TakeFallbackContentFrom(RenderWidgetHostView* view) override;
-  void EnsureSurfaceSynchronizedForWebTest() override {}
+  void EnsureSurfaceSynchronizedForWebTest() override;
 
   // RenderWidgetHostViewBase:
+  uint32_t GetCaptureSequenceNumber() const override;
   void InitAsPopup(RenderWidgetHostView* parent_host_view,
                    const gfx::Rect& bounds) override {}
   void InitAsFullscreen(RenderWidgetHostView* reference_host_view) override {}
@@ -134,6 +135,11 @@ class TestRenderWidgetHostView : public RenderWidgetHostViewBase,
   bool is_occluded_;
   ui::DummyTextInputClient text_input_client_;
 
+  // Latest capture sequence number which is incremented when the caller
+  // requests surfaces be synchronized via
+  // EnsureSurfaceSynchronizedForWebTest().
+  uint32_t latest_capture_sequence_number_ = 0u;
+
 #if defined(USE_AURA)
   std::unique_ptr<aura::Window> window_;
 #endif