Add support for type checking of floating point attributes

Source/modules/mediasource/SourceBuffer.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 157 matching lines @@
     return TimeRanges::create(m_webSourceBuffer->buffered());
 }
 
 double SourceBuffer::timestampOffset() const
 {
     return m_timestampOffset;
 }
 
 void SourceBuffer::setTimestampOffset(double offset, ExceptionState& exceptionState)
 {
-    // Enforce throwing an exception on restricted double values.
-    if (!std::isfinite(offset)) {
-        exceptionState.throwTypeError(ExceptionMessages::notAFiniteNumber(offset));
-        return;
-    }
-
     // Section 3.1 timestampOffset attribute setter steps.
+    // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-SourceBuffer-timestampOffset
     // 1. Let new timestamp offset equal the new value being assigned to this attribute.
     // 2. If this object has been removed from the sourceBuffers attribute of the parent media source, then throw an
     //    InvalidStateError exception and abort these steps.
     // 3. If the updating attribute equals true, then throw an InvalidStateError exception and abort these steps.
     if (throwExceptionIfRemovedOrUpdating(isRemoved(), m_updating, exceptionState))
         return;
 
     // 4. If the readyState attribute of the parent media source is in the "ended" state then run the following steps:
     // 4.1 Set the readyState attribute of the parent media source to "open"
     // 4.2 Queue a task to fire a simple event named sourceopen at the parent media source.
@@ skipping 10 matching lines @@
     m_timestampOffset = offset;
 }
 
 double SourceBuffer::appendWindowStart() const
 {
     return m_appendWindowStart;
 }
 
 void SourceBuffer::setAppendWindowStart(double start, ExceptionState& exceptionState)
 {
-    // Enforce throwing an exception on restricted double values.
-    if (!std::isfinite(start)) {
-        exceptionState.throwTypeError(ExceptionMessages::notAFiniteNumber(start));
-        return;
-    }
-
     // Section 3.1 appendWindowStart attribute setter steps.
+    // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-SourceBuffer-appendWindowStart
     // 1. If this object has been removed from the sourceBuffers attribute of the parent media source then throw an
     //    InvalidStateError exception and abort these steps.
     // 2. If the updating attribute equals true, then throw an InvalidStateError exception and abort these steps.
     if (throwExceptionIfRemovedOrUpdating(isRemoved(), m_updating, exceptionState))
         return;
 
     // 3. If the new value is less than 0 or greater than or equal to appendWindowEnd then throw an InvalidAccessError
     //    exception and abort these steps.
     if (start < 0 || start >= m_appendWindowEnd) {
         exceptionState.throwDOMException(InvalidAccessError, ExceptionMessages::indexOutsideRange("value", start, 0.0, ExceptionMessages::ExclusiveBound, m_appendWindowEnd, ExceptionMessages::InclusiveBound));
         return;
     }
 
     m_webSourceBuffer->setAppendWindowStart(start);
 
     // 4. Update the attribute to the new value.
     m_appendWindowStart = start;
 }
 
 double SourceBuffer::appendWindowEnd() const
 {
     return m_appendWindowEnd;
 }
 
 void SourceBuffer::setAppendWindowEnd(double end, ExceptionState& exceptionState)
 {
     // Section 3.1 appendWindowEnd attribute setter steps.
+    // https://dvcs.w3.org/hg/html-media/raw-file/tip/media-source/media-source.html#widl-SourceBuffer-appendWindowEnd
     // 1. If this object has been removed from the sourceBuffers attribute of the parent media source then throw an
     //    InvalidStateError exception and abort these steps.
     // 2. If the updating attribute equals true, then throw an InvalidStateError exception and abort these steps.
     if (throwExceptionIfRemovedOrUpdating(isRemoved(), m_updating, exceptionState))
         return;
 
     // 3. If the new value equals NaN, then throw an InvalidAccessError and abort these steps.
     // 4. If the new value is less than or equal to appendWindowStart then throw an InvalidAccessError
     //    exception and abort these steps.
     if (std::isnan(end)) {
@@ skipping 448 matching lines @@
     appendStreamDone(false);
 }
 
 void SourceBuffer::trace(Visitor* visitor)
 {
     visitor->trace(m_source);
     visitor->trace(m_stream);
 }
 
 } // namespace WebCore