[Chromecast] Reduce CPU cost of conversion to interleaved

Avoid clamping the sample range for each filter group. We still clamp in
StreamMixer::WriteMixedPcm() before sending to output.

Bug: internal b/142504553
Change-Id: I5a7376c229e9146ea25ebed40f8da1a46cc40c96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856462Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705360}

chromecast/media/cma/backend/mixer/filter_group.cc

@@ -144,7 +144,7 @@ float FilterGroup::MixAndFilter(
     }
   }
 
-  mixed_->ToInterleaved<::media::FloatSampleTypeTraits<float>>(
+  mixed_->ToInterleaved<::media::FloatSampleTypeTraitsNoClip<float>>(
       input_frames_per_write_, interleaved_.data());
 
   // Mix FilterGroups