Allow XHR timeout attribute to be overridden after send(), per spec

Source/core/loader/DocumentThreadableLoader.cpp

Index: Source/core/loader/DocumentThreadableLoader.cpp
diff --git a/Source/core/loader/DocumentThreadableLoader.cpp b/Source/core/loader/DocumentThreadableLoader.cpp
index 2840dce77f4d9e26c4eae1e3c59f20864f715df6..055d71cd9ad3de3f6aeb8a32b98d2876c25b612c 100644
--- a/Source/core/loader/DocumentThreadableLoader.cpp
+++ b/Source/core/loader/DocumentThreadableLoader.cpp
@@ -76,6 +76,7 @@ DocumentThreadableLoader::DocumentThreadableLoader(Document& document, Threadabl
     , m_simpleRequest(true)
     , m_async(blockingBehavior == LoadAsynchronously)
     , m_timeoutTimer(this, &DocumentThreadableLoader::didTimeout)
+    , m_requestStarted(0.0)
 {
     ASSERT(client);
     // Setting an outgoing referer is only supported in the async code path.
@@ -138,6 +139,26 @@ DocumentThreadableLoader::~DocumentThreadableLoader()
 {
 }
 
+void DocumentThreadableLoader::overrideTimeout(unsigned long timeoutMilliseconds)
+{
+    if (!m_async)
+        return;
+    m_timeoutTimer.stop();
+    // At the time of this method's implementation, it is only ever called by
+    // XMLHttpRequest, when the timeout attribute is set after sending the
+    // request.
+    //
+    // The XHR request says to resolve the time relative to when the request
+    // was initially sent, however other uses of this method may need to
+    // behave differently, in which case this should be re-arranged somehow.
+    if (timeoutMilliseconds) {
+        double elapsedTime = (monotonicallyIncreasingTime() - m_requestStarted);

[tyoshino (SeeGerritForStatus), 2014/05/12 09:21:17]

remove parentheses

+        double nextFire = timeoutMilliseconds / 1000.0;
+        double resolvedTime = nextFire > elapsedTime ? nextFire - elapsedTime : 0.0;
+        m_timeoutTimer.startOneShot(resolvedTime, FROM_HERE);
+    }
+}
+
 void DocumentThreadableLoader::cancel()
 {
     cancelWithError(ResourceError());
@@ -396,6 +417,7 @@ void DocumentThreadableLoader::loadRequest(const ResourceRequest& request)
 
         if (m_options.timeoutMilliseconds > 0)
             m_timeoutTimer.startOneShot(m_options.timeoutMilliseconds / 1000.0, FROM_HERE);
+        m_requestStarted = monotonicallyIncreasingTime();
 
         FetchRequest newRequest(request, m_options.initiator, options);
         ASSERT(!resource());