Plumb smooth scrolling in Chromium compositor

content/browser/web_contents/web_contents_android.cc

 // Copyright 2013 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 "content/browser/web_contents/web_contents_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/command_line.h"
@@ skipping 375 matching lines @@
 void WebContentsAndroid::ScrollFocusedEditableNodeIntoView(
     JNIEnv* env,
     jobject obj) {
   RenderViewHost* host = web_contents_->GetRenderViewHost();
   if (!host)
     return;
   host->Send(new InputMsg_ScrollFocusedEditableNodeIntoRect(
       host->GetRoutingID(), gfx::Rect()));
 }
 
+void WebContentsAndroid::SmoothScroll(JNIEnv* env,
+                                      jobject obj,
+                                      jint targetX,
+                                      jint targetY,

[jdduke (slow), 2015/07/27 17:15:38]

Nit: target_x,target_y,duration_ms

[hush (inactive), 2015/07/28 00:10:43]

Done.

+                                      jlong durationMs) {
+  RenderViewHost* host = web_contents_->GetRenderViewHost();
+  if (!host)
+    return;
+
+  ContentViewCoreImpl* contentViewCore =
+      ContentViewCoreImpl::FromWebContents(web_contents_);
+  float scale_factor = contentViewCore->GetScaleFactor();
+  host->Send(new InputMsg_SmoothScroll(host->GetRoutingID(),
+                                       targetX / scale_factor,
+                                       targetY / scale_factor, durationMs));
+}
+
 void WebContentsAndroid::SelectWordAroundCaret(JNIEnv* env, jobject obj) {
   RenderViewHost* host = web_contents_->GetRenderViewHost();
   if (!host)
     return;
   host->SelectWordAroundCaret();
 }
 
 void WebContentsAndroid::AdjustSelectionByCharacterOffset(JNIEnv* env,
                                                           jobject obj,
                                                           jint start_adjust,
@@ skipping 111 matching lines @@
 
 void WebContentsAndroid::ResumeMediaSession(JNIEnv* env, jobject obj) {
   web_contents_->ResumeMediaSession();
 }
 
 void WebContentsAndroid::SuspendMediaSession(JNIEnv* env, jobject obj) {
   web_contents_->SuspendMediaSession();
 }
 
 }  // namespace content