Support sample rates up to 384 kHz.

third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp

Index: third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
index cb83b9a35728164a9ca67af4e53409db1ed868a5..900ff22c283d102ac3df0e3c25c321ab9442c380 100644
--- a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.cpp
@@ -237,8 +237,9 @@ AudioBuffer* BaseAudioContext::createBuffer(unsigned numberOfChannels,
     // AudioUtilities::minAudioBufferSampleRate() and
     // AudioUtilities::maxAudioBufferSampleRate().  The number of buckets is
     // fairly arbitrary.
-    DEFINE_STATIC_LOCAL(CustomCountHistogram, audioBufferSampleRateHistogram,
-                        ("WebAudio.AudioBuffer.SampleRate", 3000, 192000, 60));
+    DEFINE_STATIC_LOCAL(
+        CustomCountHistogram, audioBufferSampleRateHistogram,
+        ("WebAudio.AudioBuffer.SampleRate384kHz", 3000, 384000, 60));
 
     audioBufferChannelsHistogram.sample(numberOfChannels);
     audioBufferLengthHistogram.count(numberOfFrames);
@@ -250,13 +251,13 @@ AudioBuffer* BaseAudioContext::createBuffer(unsigned numberOfChannels,
     // integer.  If the context is closed, don't record this because we
     // don't have a sample rate for closed context.
     if (!isContextClosed()) {
-      // The limits are choosen from 100*(3000/192000) = 1.5625 and
-      // 100*(192000/3000) = 6400, where 3000 and 192000 are the current
+      // The limits are choosen from 100*(3000/384000) = 0.78125 and
+      // 100*(384000/3000) = 12800, where 3000 and 384000 are the current
       // min and max sample rates possible for an AudioBuffer.  The number
       // of buckets is fairly arbitrary.
       DEFINE_STATIC_LOCAL(
           CustomCountHistogram, audioBufferSampleRateRatioHistogram,
-          ("WebAudio.AudioBuffer.SampleRateRatio", 1, 6400, 50));
+          ("WebAudio.AudioBuffer.SampleRateRatio384kHz", 1, 12800, 50));
       float ratio = 100 * sampleRate / this->sampleRate();
       audioBufferSampleRateRatioHistogram.count(static_cast<int>(0.5 + ratio));
     }