Update VideoBitrateAllocator allocate to take a struct with more fields

We want to evaluate more data in order to make better choices in the
bitrate allocators.
In order to freely update the parameter list without
breaking the API many times for projects customizing them, we'll use a
struct instead.

Bug: webrtc:10126
Change-Id: I443f86781c5134950294cdd1e3197a47447cf973
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/141418
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28748}

modules/video_coding/utility/simulcast_rate_allocator.cc

@@ -13,6 +13,7 @@
 #include <stdio.h>
 
 #include <algorithm>
+#include <cmath>
 #include <cstdint>
 #include <numeric>
 #include <string>
@@ -63,13 +64,13 @@ SimulcastRateAllocator::SimulcastRateAllocator(const VideoCodec& codec)
 
 SimulcastRateAllocator::~SimulcastRateAllocator() = default;
 
-VideoBitrateAllocation SimulcastRateAllocator::GetAllocation(
-    uint32_t total_bitrate_bps,
-    uint32_t framerate) {
+VideoBitrateAllocation SimulcastRateAllocator::Allocate(
+    VideoBitrateAllocationParameters parameters) {
   VideoBitrateAllocation allocated_bitrates_bps;
-  DistributeAllocationToSimulcastLayers(total_bitrate_bps,
+  DistributeAllocationToSimulcastLayers(parameters.total_bitrate.bps(),
                                         &allocated_bitrates_bps);
-  DistributeAllocationToTemporalLayers(framerate, &allocated_bitrates_bps);
+  DistributeAllocationToTemporalLayers(std::ceil(parameters.framerate),
+                                       &allocated_bitrates_bps);
   return allocated_bitrates_bps;
 }