Use int64 time stamp when storing metadata to the HTTP cache.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index c208323a63c578146f321da8d4863186311f198e..2cd35a1c7adf88a9ef1250ed81a9b890bcf5d378 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -422,6 +422,9 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message) {
         OnAllocateLockedDiscardableSharedMemory)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidGenerateCacheableMetadata,
                         OnCacheableMetadataAvailable)
+    IPC_MESSAGE_HANDLER(
+        ViewHostMsg_DidGenerateCacheableMetadataOriginalResponseTime,
+        OnCacheableMetadataAvailableOriginalResponseTime)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(ViewHostMsg_Keygen, OnKeygen)
     IPC_MESSAGE_HANDLER(ViewHostMsg_GetAudioHardwareConfig,
                         OnGetAudioHardwareConfig)
@@ -991,8 +994,33 @@ void RenderMessageFilter::OnCacheableMetadataAvailable(
   const net::RequestPriority kPriority = net::LOW;
   scoped_refptr<net::IOBuffer> buf(new net::IOBuffer(data.size()));
   memcpy(buf->data(), &data.front(), data.size());
-  cache->WriteMetadata(url, kPriority, expected_response_time, buf.get(),
-                       data.size());
+  // TODO(yangguo): issue 453298.  The time conversion is lossy. Use
+  // OnCacheableMetadataAvailableOriginalResponseTime instead.
+  cache->WriteMetadata(url, kPriority,
+                       base::Time::FromDoubleT(expected_response_time),
+                       buf.get(), data.size());
+}
+
+void RenderMessageFilter::OnCacheableMetadataAvailableOriginalResponseTime(
+    const GURL& url,
+    int64 expected_response_time,
+    const std::vector<char>& data) {
+  net::HttpCache* cache = request_context_->GetURLRequestContext()
+                              ->http_transaction_factory()
+                              ->GetCache();
+  DCHECK(cache);
+
+  // Use the same priority for the metadata write as for script
+  // resources (see defaultPriorityForResourceType() in WebKit's
+  // CachedResource.cpp). Note that WebURLRequest::PriorityMedium
+  // corresponds to net::LOW (see ConvertWebKitPriorityToNetPriority()
+  // in weburlloader_impl.cc).
+  const net::RequestPriority kPriority = net::LOW;
+  scoped_refptr<net::IOBuffer> buf(new net::IOBuffer(data.size()));
+  memcpy(buf->data(), &data.front(), data.size());
+  cache->WriteMetadata(url, kPriority,
+                       base::Time::FromInternalValue(expected_response_time),
+                       buf.get(), data.size());
 }
 
 void RenderMessageFilter::OnKeygen(uint32 key_size_index,