Add accessor for frameTimingRequests for blink unit tests.

cc/blink/web_layer_impl.cc

Index: cc/blink/web_layer_impl.cc
diff --git a/cc/blink/web_layer_impl.cc b/cc/blink/web_layer_impl.cc
index 3c688a6bbd41ecde8d412817f8177df7ebe0a7a7..8bad92a002e6b9bd13d3aca21f2b800da2ddeded 100644
--- a/cc/blink/web_layer_impl.cc
+++ b/cc/blink/web_layer_impl.cc
@@ -365,12 +365,27 @@ void WebLayerImpl::setFrameTimingRequests(
     const WebVector<std::pair<int64_t, WebRect>>& requests) {
   std::vector<cc::FrameTimingRequest> frame_timing_requests(requests.size());
   for (size_t i = 0; i < requests.size(); ++i) {
-    frame_timing_requests.push_back(cc::FrameTimingRequest(
-        requests[i].first, gfx::Rect(requests[i].second)));
+    frame_timing_requests[i] = cc::FrameTimingRequest(
+        requests[i].first, gfx::Rect(requests[i].second));
   }
   layer_->SetFrameTimingRequests(frame_timing_requests);
 }
 
+WebVector<std::pair<int64_t, WebRect>> WebLayerImpl::frameTimingRequests()
+    const {
+  const std::vector<cc::FrameTimingRequest>& frame_timing_requests =
+      layer_->FrameTimingRequests();
+
+  size_t num_requests = frame_timing_requests.size();
+
+  WebVector<std::pair<int64_t, WebRect>> result(num_requests);
+  for (size_t i = 0; i < num_requests; ++i) {
+    result[i] = std::make_pair(frame_timing_requests[i].id(),
+                               frame_timing_requests[i].rect());
+  }
+  return result;
+}
+
 void WebLayerImpl::setTouchEventHandlerRegion(const WebVector<WebRect>& rects) {
   cc::Region region;
   for (size_t i = 0; i < rects.size(); ++i)