Unify Android Webview and Chrome's fling

android_webview/native/aw_contents.cc

Index: android_webview/native/aw_contents.cc
diff --git a/android_webview/native/aw_contents.cc b/android_webview/native/aw_contents.cc
index e0dc28c8c16792f3c683f7b3766f4cc69e8e0ef3..016a1b0fca645eaa69277e4bd6d1290617ece3c2 100644
--- a/android_webview/native/aw_contents.cc
+++ b/android_webview/native/aw_contents.cc
@@ -924,6 +924,15 @@ void AwContents::SetBackgroundColor(JNIEnv* env, jobject obj, jint color) {
   render_view_host_ext_->SetBackgroundColor(color);
 }
 
+void AwContents::OnComputeScroll(JNIEnv* env,
+                                 jobject obj,
+                                 jlong animation_time_millis) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  browser_view_renderer_.OnComputeScroll(
+      base::TimeTicks() +
+      base::TimeDelta::FromMilliseconds(animation_time_millis));
+}
+
 jlong AwContents::ReleasePopupAwContents(JNIEnv* env, jobject obj) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   return reinterpret_cast<intptr_t>(pending_contents_.release());
@@ -983,14 +992,19 @@ void AwContents::UpdateScrollState(gfx::Vector2d max_scroll_offset,
                                     max_page_scale_factor);
 }
 
-void AwContents::DidOverscroll(gfx::Vector2d overscroll_delta) {
+void AwContents::DidOverscroll(gfx::Vector2d overscroll_delta,
+                               gfx::Vector2dF overscroll_velocity,
+                               bool first_overscroll_x,
+                               bool first_overscroll_y) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
   if (obj.is_null())
     return;
-  Java_AwContents_didOverscroll(
-      env, obj.obj(), overscroll_delta.x(), overscroll_delta.y());
+  Java_AwContents_didOverscroll(env, obj.obj(), overscroll_delta.x(),
+                                overscroll_delta.y(), overscroll_velocity.x(),
+                                overscroll_velocity.y(), first_overscroll_x,
+                                first_overscroll_y);
 }
 
 void AwContents::SetDipScale(JNIEnv* env, jobject obj, jfloat dip_scale) {