Convert main-thread overscroll parameters into viewport space.

content/renderer/render_widget.cc

 // Copyright (c) 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 "content/renderer/render_widget.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 2000 matching lines @@
     DCHECK(webwidget_);
     if (webwidget_->textInputInfo().value.isEmpty())
       UpdateTextInputState(ShowIme::HIDE_IME, ChangeSource::FROM_NON_IME);
     else
       UpdateTextInputState(ShowIme::IF_NEEDED, ChangeSource::FROM_NON_IME);
   }
 #endif
 }
 
 void RenderWidget::didOverscroll(
-    const blink::WebFloatSize& unusedDelta,
-    const blink::WebFloatSize& accumulatedRootOverScroll,
+    const blink::WebFloatSize& overscrollDelta,
+    const blink::WebFloatSize& accumulatedOverscroll,
     const blink::WebFloatPoint& position,
     const blink::WebFloatSize& velocity) {
 #if defined(OS_MACOSX)
   // On OSX the user can disable the elastic overscroll effect. If that's the
   // case, don't forward the overscroll notification.
   DCHECK(compositor_deps());
   if (!compositor_deps()->IsElasticOverscrollEnabled())
     return;
 #endif
-  input_handler_->DidOverscrollFromBlink(unusedDelta, accumulatedRootOverScroll,
+  input_handler_->DidOverscrollFromBlink(overscrollDelta, accumulatedOverscroll,
                                          position, velocity);
 }
 
 void RenderWidget::StartCompositor() {
   if (!is_hidden())
     compositor_->setVisible(true);
 }
 
 RenderWidgetCompositor* RenderWidget::compositor() const {
   return compositor_.get();
@@ skipping 141 matching lines @@
 }
 
 float RenderWidget::GetOriginalDeviceScaleFactor() const {
   return
       screen_metrics_emulator_ ?
       screen_metrics_emulator_->original_screen_info().deviceScaleFactor :
       device_scale_factor_;
 }
 
 }  // namespace content