Implement clamping of AudioParam time.

third_party/WebKit/Source/modules/webaudio/AudioParamTimeline.h

Index: third_party/WebKit/Source/modules/webaudio/AudioParamTimeline.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioParamTimeline.h b/third_party/WebKit/Source/modules/webaudio/AudioParamTimeline.h
index f163224fca06f3049d5b39b75cd413618ba6ae08..af85e1c7398713b97ab506be16a886ecbb2c432f 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioParamTimeline.h
+++ b/third_party/WebKit/Source/modules/webaudio/AudioParamTimeline.h
@@ -127,11 +127,14 @@ class AudioParamTimeline {
     Type getType() const { return m_type; }
     float value() const { return m_value; }
     double time() const { return m_time; }
+    void setTime(double newTime) { m_time = newTime; }
     double timeConstant() const { return m_timeConstant; }
     double duration() const { return m_duration; }
     Vector<float>& curve() { return m_curve; }
     float initialValue() const { return m_initialValue; }
     double callTime() const { return m_callTime; }
+    bool needsTimeClampCheck() const { return m_needsTimeClampCheck; }
+    void clearTimeClampCheck() { m_needsTimeClampCheck = false; }
 
    private:
     ParamEvent(Type type,
@@ -155,6 +158,9 @@ class AudioParamTimeline {
     // have a preceding event.
     float m_initialValue;
     double m_callTime;
+    // True if the start time needs to be checked against current time
+    // to implement clamping.
+    bool m_needsTimeClampCheck;
   };
 
   void insertEvent(const ParamEvent&, ExceptionState&);