Update audio code to use size_t more correctly, webrtc/common_audio/resampler/

webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc

Index: webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc
diff --git a/webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc b/webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc
index 597820b15df2dc861a4bd37ecbece96b396f2899..07b8339277663e8ac48ca5470fdd4fae99b0fc77 100644
--- a/webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc
+++ b/webrtc/common_audio/resampler/sinusoidal_linear_chirp_source.cc
@@ -18,7 +18,9 @@
 namespace webrtc {
 
 SinusoidalLinearChirpSource::SinusoidalLinearChirpSource(int sample_rate,
-  int samples, double max_frequency, double delay_samples)
+                                                         size_t samples,
+                                                         double max_frequency,
+                                                         size_t delay_samples)
     : sample_rate_(sample_rate),
       total_samples_(samples),
       max_frequency_(max_frequency),
@@ -29,8 +31,8 @@ SinusoidalLinearChirpSource::SinusoidalLinearChirpSource(int sample_rate,
   k_ = (max_frequency_ - kMinFrequency) / duration;
 }
 
-void SinusoidalLinearChirpSource::Run(int frames, float* destination) {
-  for (int i = 0; i < frames; ++i, ++current_index_) {
+void SinusoidalLinearChirpSource::Run(size_t frames, float* destination) {
+  for (size_t i = 0; i < frames; ++i, ++current_index_) {
     // Filter out frequencies higher than Nyquist.
     if (Frequency(current_index_) > 0.5 * sample_rate_) {
       destination[i] = 0;
@@ -40,7 +42,8 @@ void SinusoidalLinearChirpSource::Run(int frames, float* destination) {
         destination[i] = 0;
       } else {
         // Sinusoidal linear chirp.
-        double t = (current_index_ - delay_samples_) / sample_rate_;
+        double t =
+            static_cast<double>(current_index_ - delay_samples_) / sample_rate_;
         destination[i] =
             sin(2 * M_PI * (kMinFrequency * t + (k_ / 2) * t * t));
       }
@@ -48,8 +51,8 @@ void SinusoidalLinearChirpSource::Run(int frames, float* destination) {
   }
 }
 
-double SinusoidalLinearChirpSource::Frequency(int position) {
-  return kMinFrequency + (position - delay_samples_) *
+double SinusoidalLinearChirpSource::Frequency(size_t position) {
+  return kMinFrequency + (static_cast<double>(position) - delay_samples_) *
       (max_frequency_ - kMinFrequency) / total_samples_;
 }