Fix ResourceLoadTiming resolution lose issue (chromium part)

To Fix ResourceLoadTiming resolution lose issue, "int" deltas in millisecond will be replaced
by "double" monotonicallyIncreasing time in blink. This change remove previous delta calculation
in glue, and pass nature monotonicallyIncreasing time to blink.

Contributed by pan.deng@intel.com
 
BUG=242452

Review URL: https://chromiumcodereview.appspot.com/15552003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202765 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 20 insertions, 34 deletions

diff --git a/webkit/glue/weburlloader_impl.cc b/webkit/glue/weburlloader_impl.cc
index 2145ce3..d550422 100644
--- a/webkit/glue/weburlloader_impl.cc
+++ b/webkit/glue/weburlloader_impl.cc
@@ -150,51 +150,37 @@ bool GetInfoFromDataURL(const GURL& url,
 
 typedef ResourceDevToolsInfo::HeadersVector HeadersVector;
 
-// Given a base time and a second time, returns the time from the base time to
-// the second time, in milliseconds.  If the second time is null, returns -1.
-// The base time must not be null.
-int TimeTicksToOffset(base::TimeTicks base_time, base::TimeTicks time) {
-  if (time.is_null())
-    return -1;
-  DCHECK(!base_time.is_null());
-  return static_cast<int>((time - base_time).InMillisecondsRoundedUp());
-}
-
 // Converts timing data from |load_timing| to the format used by WebKit.
 void PopulateURLLoadTiming(const net::LoadTimingInfo& load_timing,
                            WebURLLoadTiming* url_timing) {
   DCHECK(!load_timing.request_start.is_null());
 
+  const TimeTicks kNullTicks;
   url_timing->initialize();
   url_timing->setRequestTime(
-      (load_timing.request_start - TimeTicks()).InSecondsF());
-  url_timing->setProxyStart(TimeTicksToOffset(load_timing.request_start,
-                                              load_timing.proxy_resolve_start));
-  url_timing->setProxyEnd(TimeTicksToOffset(load_timing.request_start,
-                                            load_timing.proxy_resolve_end));
-  url_timing->setDNSStart(TimeTicksToOffset(
-      load_timing.request_start,
-      load_timing.connect_timing.dns_start));
-  url_timing->setDNSEnd(TimeTicksToOffset(load_timing.request_start,
-                                          load_timing.connect_timing.dns_end));
+      (load_timing.request_start - kNullTicks).InSecondsF());
+  url_timing->setProxyStart(
+      (load_timing.proxy_resolve_start - kNullTicks).InSecondsF());
+  url_timing->setProxyEnd(
+      (load_timing.proxy_resolve_end - kNullTicks).InSecondsF());
+  url_timing->setDNSStart(
+      (load_timing.connect_timing.dns_start - kNullTicks).InSecondsF());
+  url_timing->setDNSEnd(
+      (load_timing.connect_timing.dns_end - kNullTicks).InSecondsF());
   url_timing->setConnectStart(
-      TimeTicksToOffset(load_timing.request_start,
-                        load_timing.connect_timing.connect_start));
+      (load_timing.connect_timing.connect_start - kNullTicks).InSecondsF());
   url_timing->setConnectEnd(
-      TimeTicksToOffset(load_timing.request_start,
-                        load_timing.connect_timing.connect_end));
+      (load_timing.connect_timing.connect_end - kNullTicks).InSecondsF());
   url_timing->setSSLStart(
-      TimeTicksToOffset(load_timing.request_start,
-                        load_timing.connect_timing.ssl_start));
-  url_timing->setSSLEnd(TimeTicksToOffset(load_timing.request_start,
-                                          load_timing.connect_timing.ssl_end));
-  url_timing->setSendStart(TimeTicksToOffset(load_timing.request_start,
-                                             load_timing.send_start));
-  url_timing->setSendEnd(TimeTicksToOffset(load_timing.request_start,
-                                           load_timing.send_end));
+      (load_timing.connect_timing.ssl_start - kNullTicks).InSecondsF());
+  url_timing->setSSLEnd(
+      (load_timing.connect_timing.ssl_end - kNullTicks).InSecondsF());
+  url_timing->setSendStart(
+      (load_timing.send_start - kNullTicks).InSecondsF());
+  url_timing->setSendEnd(
+      (load_timing.send_end - kNullTicks).InSecondsF());
   url_timing->setReceiveHeadersEnd(
-      TimeTicksToOffset(load_timing.request_start,
-                        load_timing.receive_headers_end));
+      (load_timing.receive_headers_end - kNullTicks).InSecondsF());
 }
 
 void PopulateURLResponse(