Plumb smooth scrolling in Chromium compositor

android_webview/native/aw_contents.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "android_webview/native/aw_contents.h"
 
 #include <limits>
 
 #include "android_webview/browser/aw_browser_context.h"
 #include "android_webview/browser/aw_browser_main_parts.h"
@@ skipping 1048 matching lines @@
 
 void AwContents::SetDipScaleInternal(float dip_scale) {
   browser_view_renderer_.SetDipScale(dip_scale);
 }
 
 void AwContents::ScrollTo(JNIEnv* env, jobject obj, jint x, jint y) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   browser_view_renderer_.ScrollTo(gfx::Vector2d(x, y));
 }
 
+void AwContents::SmoothScroll(JNIEnv* env,
+                              jobject obj,
+                              jint target_x,
+                              jint target_y,
+                              jlong duration_ms) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  float scale = browser_view_renderer_.dip_scale() *
+                browser_view_renderer_.page_scale_factor();
+  render_view_host_ext_->SmoothScroll(target_x / scale, target_y / scale,
+                                      duration_ms);
+}
+
 void AwContents::OnWebLayoutPageScaleFactorChanged(float page_scale_factor) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
   if (obj.is_null())
     return;
   Java_AwContents_onWebLayoutPageScaleFactorChanged(env, obj.obj(),
                                                          page_scale_factor);
 }
 
@@ skipping 134 matching lines @@
 void AwContents::GrantFileSchemeAccesstoChildProcess(JNIEnv* env, jobject obj) {
   content::ChildProcessSecurityPolicy::GetInstance()->GrantScheme(
       web_contents_->GetRenderProcessHost()->GetID(), url::kFileScheme);
 }
 
 void SetShouldDownloadFavicons(JNIEnv* env, jclass jclazz) {
   g_should_download_favicons = true;
 }
 
 }  // namespace android_webview