ScrollableArea::pixelsPerLine should return viewport pixels in use-zoom-for-dsf mode

third_party/WebKit/Source/web/ChromeClientImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 502 matching lines @@
 
     if (m_webView->client()) {
         m_webView->client()->convertViewportToWindow(&screenRect);
         WebRect windowRect = m_webView->client()->windowRect();
         screenRect.x += windowRect.x;
         screenRect.y += windowRect.y;
     }
     return screenRect;
 }
 
-FloatRect ChromeClientImpl::windowToViewport(const FloatRect& rectInWindow) const
+float ChromeClientImpl::windowToViewportScalar(const float scalarValue) const
 {
-    WebFloatRect viewportRect(rectInWindow);
-    if (m_webView->client())
-        m_webView->client()->convertWindowToViewport(&viewportRect);
-    return viewportRect;
+    if (!m_webView->client())
+        return scalarValue;
+    WebFloatRect viewportRect(0, 0, scalarValue, 0);
+    m_webView->client()->convertWindowToViewport(&viewportRect);
+    return viewportRect.width;
 }
 
 WebScreenInfo ChromeClientImpl::screenInfo() const
 {
     return m_webView->client() ? m_webView->client()->screenInfo() : WebScreenInfo();
 }
 
 void ChromeClientImpl::contentsSizeChanged(LocalFrame* frame, const IntSize& size) const
 {
     m_webView->didChangeContentsSize();
@@ skipping 518 matching lines @@
     if (m_webView->pageImportanceSignals())
         m_webView->pageImportanceSignals()->setIssuedNonGetFetchFromScript();
 }
 
 PassOwnPtr<WebFrameScheduler> ChromeClientImpl::createFrameScheduler()
 {
     return m_webView->scheduler()->createFrameScheduler().release();
 }
 
 } // namespace blink