Record WebView startup timestamps and add API to access them.

This change records timestamps that happen before the WebView APK's code
is loaded and can record timestamps itself.

Bug: 177895749
Test: n/a
Change-Id: Ibb832fa13e868846625cc02c584a535a11561c66

1 files changed, 11 insertions, 0 deletions

diff --git a/core/java/android/webkit/WebViewDelegate.java b/core/java/android/webkit/WebViewDelegate.java
index 950dc7300ba9..c7eac6c72936 100644
--- a/core/java/android/webkit/WebViewDelegate.java
+++ b/core/java/android/webkit/WebViewDelegate.java
@@ -218,4 +218,15 @@ public final class WebViewDelegate {
     public String getDataDirectorySuffix() {
         return WebViewFactory.getDataDirectorySuffix();
     }
+
+    /**
+     * Returns an array of startup timestamps. For the specification of array
+     * see {@link WebViewFactory.Timestamp}.
+     * This method must be called on the same thread where the
+     * WebViewChromiumFactoryProvider#create method was invoked.
+     */
+    @NonNull
+    public long[] getTimestamps() {
+        return WebViewFactory.getTimestamps();
+    }
 }