[CustomTabs] Report the navigation start as absolute time

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
index b133dd5df29405a4197945ea4e078dadffd70241..dc58975580cbbf93072d35323c4b0d387ab52bcd 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabActivity.java
@@ -130,11 +130,12 @@ public class CustomTabActivity extends ChromeActivity {
         }
 
         @Override
-        public void onFirstContentfulPaint(WebContents webContents, long firstContentfulPaintMs) {
+        public void onFirstContentfulPaint(
+                WebContents webContents, long navigationStartMs, long firstContentfulPaintMs) {
             if (webContents != mTab.getWebContents()) return;
 
-            mConnection.notifyPageLoadMetric(
-                    mSession, PageLoadMetrics.FIRST_CONTENTFUL_PAINT, firstContentfulPaintMs);
+            mConnection.notifyPageLoadMetric(mSession, PageLoadMetrics.FIRST_CONTENTFUL_PAINT,
+                    navigationStartMs, firstContentfulPaintMs);
         }
     }