Add a new frame generator that cycles through randomly generated slides.

webrtc/test/frame_generator_capturer.cc

Index: webrtc/test/frame_generator_capturer.cc
diff --git a/webrtc/test/frame_generator_capturer.cc b/webrtc/test/frame_generator_capturer.cc
index 73cc5aed725351d5fed26a97127b0c090b6f6f01..c58de27f567ff8d6386b2d4a6319f8c2bc7e081c 100644
--- a/webrtc/test/frame_generator_capturer.cc
+++ b/webrtc/test/frame_generator_capturer.cc
@@ -114,6 +114,22 @@ FrameGeneratorCapturer* FrameGeneratorCapturer::CreateFromYuvFile(
   return capturer.release();
 }
 
+FrameGeneratorCapturer* FrameGeneratorCapturer::CreateSlideGenerator(
+    size_t width,
+    size_t height,
+    int frame_repeat_count,
+    int target_fps,
+    Clock* clock) {
+  std::unique_ptr<FrameGeneratorCapturer> capturer(new FrameGeneratorCapturer(
+      clock, FrameGenerator::CreateSlideGenerator(width, height,
+                                                  frame_repeat_count),
+      target_fps));
+  if (!capturer->Init())
+    return nullptr;
+
+  return capturer.release();
+}
+
 FrameGeneratorCapturer::FrameGeneratorCapturer(
     Clock* clock,
     std::unique_ptr<FrameGenerator> frame_generator,