Use the frame time from Choreographer for computeScroll animation time.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index a98057a4637da49194007cea9199dedd19c32741..dd9a40d374cf08981d37a76bd01cbd1cf1949093 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -37,7 +37,6 @@ import android.view.ViewStructure;
 import android.view.accessibility.AccessibilityEvent;
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.view.accessibility.AccessibilityNodeProvider;
-import android.view.animation.AnimationUtils;
 import android.view.inputmethod.EditorInfo;
 import android.view.inputmethod.InputConnection;
 import android.webkit.JavascriptInterface;
@@ -3256,7 +3255,8 @@ public class AwContents implements SmartClipProvider,
         @Override
         public void computeScroll() {
             if (isDestroyed(NO_WARN)) return;
-            nativeOnComputeScroll(mNativeAwContents, AnimationUtils.currentAnimationTimeMillis());
+            nativeOnComputeScroll(mNativeAwContents,
+                    mWindowAndroid.getWindowAndroid().getCurrentFrameTimeMillis());
         }
     }