Don't clip FFT output values to minDecibels.

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

Index: third_party/WebKit/Source/modules/webaudio/RealtimeAnalyser.cpp
diff --git a/third_party/WebKit/Source/modules/webaudio/RealtimeAnalyser.cpp b/third_party/WebKit/Source/modules/webaudio/RealtimeAnalyser.cpp
index ff7391073ad8586563c8ffc925091ef87a510da6..c27b6a3f4a6927bde406e8338d47102843675025 100644
--- a/third_party/WebKit/Source/modules/webaudio/RealtimeAnalyser.cpp
+++ b/third_party/WebKit/Source/modules/webaudio/RealtimeAnalyser.cpp
@@ -192,7 +192,6 @@ void RealtimeAnalyser::getFloatFrequencyData(DOMFloat32Array* destinationArray)
     doFFTAnalysis();
 
     // Convert from linear magnitude to floating-point decibels.
-    const double minDecibels = m_minDecibels;
     unsigned sourceLength = magnitudeBuffer().size();
     size_t len = std::min(sourceLength, destinationArray->length());
     if (len > 0) {
@@ -201,7 +200,7 @@ void RealtimeAnalyser::getFloatFrequencyData(DOMFloat32Array* destinationArray)
 
         for (unsigned i = 0; i < len; ++i) {
             float linearValue = source[i];
-            double dbMag = !linearValue ? minDecibels : AudioUtilities::linearToDecibels(linearValue);
+            double dbMag = AudioUtilities::linearToDecibels(linearValue);
             destination[i] = float(dbMag);
         }
     }
@@ -226,7 +225,7 @@ void RealtimeAnalyser::getByteFrequencyData(DOMUint8Array* destinationArray)
 
         for (unsigned i = 0; i < len; ++i) {
             float linearValue = source[i];
-            double dbMag = !linearValue ? minDecibels : AudioUtilities::linearToDecibels(linearValue);
+            double dbMag = AudioUtilities::linearToDecibels(linearValue);
 
             // The range m_minDecibels to m_maxDecibels will be scaled to byte values from 0 to UCHAR_MAX.
             double scaledValue = UCHAR_MAX * (dbMag - minDecibels) * rangeScaleFactor;