Lazily allocate WSOLA structures; saves 56kB to 765kB of memory.

media/filters/audio_renderer_algorithm_unittest.cc

Index: media/filters/audio_renderer_algorithm_unittest.cc
diff --git a/media/filters/audio_renderer_algorithm_unittest.cc b/media/filters/audio_renderer_algorithm_unittest.cc
index 12cb269f9e0e161eaeb69b5361071352faf66874..21960ef68bc52eec45e5a58b7055322042e21fe8 100644
--- a/media/filters/audio_renderer_algorithm_unittest.cc
+++ b/media/filters/audio_renderer_algorithm_unittest.cc
@@ -83,7 +83,8 @@ class AudioRendererAlgorithmTest : public testing::Test {
   ~AudioRendererAlgorithmTest() override {}
 
   void Initialize() {
-    Initialize(CHANNEL_LAYOUT_STEREO, kSampleFormatS16, 3000, 300);
+    Initialize(CHANNEL_LAYOUT_STEREO, kSampleFormatS16, kSamplesPerSecond,
+               kSamplesPerSecond / 10);
   }
 
   void Initialize(ChannelLayout channel_layout,